How would you change a saturated solution to an unsaturated solution?
Q. What would you do to change: a saturated solid/liquid solution to an unsaturated solution? a saturated gas/liquid solution to an unsaturated solution?
Asked by lil_bit_country - Wed Mar 5 14:32:09 2008 - - 3 Answers - 0 Comments

A. -heat the solution (increasing temperature increases solubility) -stir the mixture - crush the solids in the mixture to increase surface area to dissolve more hope this helps!
Answered by m b - Wed Mar 5 14:36:03 2008

What is a good, intelligible solution for schools about to eliminate their art programs?
Q. I'm writing a paper against eliminating art and music classes in schools. I found a solution for music, but there are no solutions for ART classes. If you could point out a good article or two that I could use for research, with a few solutions, I would really appreciate it.
Asked by Arashi - Mon Sep 15 10:51:28 2008 - - 1 Answers - 0 Comments

A. Well roundedness is a big one, but not worth the cost in many's eyes However, there are many "real" programs where art is an asset. In first year biology you spend the majority of your labs doing drawings of what you see in your microscope. Engineering involves a lot of drawing as well. Marketing also involves some art ability, especially knowledge of colors. Same with any design jobs (like floristry, interior design etc) Here are some articles:
Answered by ~Gwen~ - Mon Sep 15 11:06:44 2008

What kind of solution do you put on charcoal that forms crystals?
Q. When I was in girl scouts we made up a solution, mixed with food coloring, and poured it over charcoal. In time beautiful crystals formed. I would like to find out what the solution was made out of to show this to my Grandchildren.
Asked by SONYA E - Tue May 27 13:31:41 2008 - - 3 Answers - 0 Comments

A. salt, ammonia and food coloring
Answered by Toonces - Tue May 27 14:26:24 2008

How much of a thirty percent solution has to be added to make a forty milligram per liter solution?
Q. We have to add forty milligrams per liter ammonia to synthetic waste water. We have purchased a thirty percent solution. How much do we add of the thirty percent solution per liter?
Asked by sternes_16_22 - Thu Jan 24 11:24:34 2008 - - 1 Answers - 0 Comments

A. I'm assuming the 30% is by weight. Given that, this means you have 300 gms/liter. So xmls (300gms/liter) = 0.04gm/liter and x = 0.133 microliters per liter of waste water. That's awfully small. To be practicle, you would either dilute the 30% and use more, or take 1000 liters of waste water and add 0.133 mls.
Answered by Simonizer1218 - Thu Jan 24 13:46:33 2008

How to create a solution of a certain percentage?
Q. This is a real-life problem I'm having, not homework. (It has been 23 years since I had AP chemistry and I'm very rusty.) I need to create a solution of 0.15% GSE. How much 33% GSE do I have to add to 88 ml of water to create the 0.15% solution? I hope this is sufficient information. Please show me your calculations, as I will use this formula again in the near future. And I thank you in advance for your help. I do mean 0.15%, as in fifteen ten-thousandths, rather than 15%, i.e., fifteen one-hundredths.
Asked by chuck - Thu Dec 7 00:58:22 2006 - - 1 Answers - 0 Comments

A. Are you sure you meant .15% and not 15%? I did the problem using the .15%, but if you meant 15%, just substitute .15 where I have .0015, and recompute it. Following is the formula: .33x + 88(0) = .0015(88+x) .33x = .0015(88) + .0015x .3285x = .132 x = .401 ml
Answered by Marcella S - Thu Dec 7 01:18:40 2006

What is the molarity of a saturated solution?
Q. What is the molarity of a saturated solution of potassium sulfate (K2SO4) if the solubility is 13 g per 100 g H2O at 25 oC? The density of the solution is 1.1g/mL please show how you got the solution, THANKS!
Asked by Trini R - Mon Jan 21 03:57:53 2008 - - 2 Answers - 0 Comments

A. Molarity = moles/liter and the molar mass of pot. sulf. is 174.259 gms/mole. You have 13 grms in 100 gms water which is = 13 gms/100 mls water = 13/174.259 moles/100mls = 0.075 moles/100mls = 0.75 moles/liter = 0.75 M.
Answered by Simonizer1218 - Mon Jan 21 08:34:53 2008

Can I use a humidifier water treatment solution to descale a bosch built in coffee machine?
Q. Bosch told me not to use vinegar to descale and suggested a humidifier descaling solution. Not sure whether to use a humidifier water treatment solution or a humidifier bacteriostat solution?
Asked by beats4u27 - Wed Dec 5 19:30:22 2007 - - 1 Answers - 0 Comments

A. Try to find humidifier water treatment solution. Or, ask Bosch what kind of acid/water solution will work (such as sulferic). I use acid (very little) on my tea kettle every 6 to 12 months and it does a great job.
Answered by unknown - Wed Dec 5 19:39:38 2007

What is the molarity of the original solution?
Q. If 43.5 mL lead(II) nitrate solution reacts completely with excess sodium iodide solution to yield 0.615 g precipitate, what is the molarity of lead(II) ion in the original solution? The method you've given me gives me the incorrect answer.
Asked by SillyMe - Thu Feb 26 10:53:28 2009 - - 1 Answers - 0 Comments

A. Molarity = Mol/ liter solution so 1) Find weight of Pb (II) 2) Divide 0.615 by weight for mols 3) Put mols over .0435 and divide 4) you have M or Molarity
Answered by WarEagle!!! - Thu Feb 26 11:03:32 2009

What is a bra solution for two different sized breasts?
Q. Lately I've been hearing many women saying that their breasts are two different sizes. It made me wonder what they do to make wearing a bra more comfortable. In all of my research I can't find any products or real solutions beyond stuffing the cup of the smaller breast. So i have to wonder what a good solution would be. Would women want an insert that matches up to make their bra fit better, or what about two different sized cups? What do you think?
Asked by blankdisk5 - Tue Nov 3 11:03:57 2009 - - 1 Answers - 0 Comments

A. All women's breasts are unequal, but women with noticeably different breasts do generally stuff - using 'chicken fillets', or will cover themselves up so no one can see their breasts. If they have any sense they go for a proper bra fitting...very few places will have bras made for two different breast sizes, but a properly fitting bra can make a big difference in making breasts look more symmetrical and look better in general. Some women go for plastic surgery to make the breasts look the same - think of it like women who have lost a breast to breast cancer, they'll do these things too, or just accept how they look and leave their breasts as they are.
Answered by Lebeautemps - Fri Nov 6 17:24:35 2009

What is the fastest solution to get a 16-17 week old dachshund potty trained?
Q. My dachshund is 16-17 weeks old and i have heard many people say it is really hard to potty train dachshunds. I am scared that she will never get pottytrained. I am trying to train her how to use a bell when she needs to go potty but im afraid that won't work either. Is there a faster solution to my problem? And i no its going to take a while to get her potty trained but i want to know the fastest solution.
Asked by Isabelle J - Fri Jul 11 12:20:25 2008 - - 14 Answers - 0 Comments

A. You train your dog by spending time with it. There is no quicker way than that
Answered by Sui - Fri Jul 11 12:28:41 2008

What is the significance of molar heat of solution?
Q. How does knowing the molar heat of solution of certain compounds help in the real world? What is a real world situation in which knowing the molar heat of solution can be useful? If you can't answer that, what is a real world situation that may relate to molar heat of solution?
Asked by babagugliana - Thu Mar 8 18:48:43 2007 - - 1 Answers - 0 Comments

A. A real world example relating to molar heats of solution are Instant Cold packs, where you activate the packet and the contents are allowed to react inside. Inside, a chemical (which can vary between companies / packs / ) is allowed to mix with water. As this chemical dissolves, it absorbs energy since it is (for this substance) an endothermic process. As it absorbs energy from its surroundings, it feels cold. These things do have uses in the real world.
Answered by mrjeffy321 - Sat Mar 10 03:12:58 2007

Whats the best solution for fleas on my cats?
Q. I have recently discovered my indoor cats (3) have fleas! I have been spraying and combing them, but, that doesn't seem to get the job done. (Everytime I clean and spray my smallest cat, there are more flees right after) What is the best solution to getting rid of these parasites? They may also be in the carpet. Would a flea dip be like, giving all of my cats a bath with flea killing shampoo? I was also thinking about buying advantage. Thanks ALOT all! You've all been a great help.
Asked by Monica - Wed Apr 9 11:44:58 2008 - - 12 Answers - 0 Comments

A. When I get fleas in my home, I treat all of my pets with a product I get at my vets. I use frontline on 5 of my six cats, and advantage on the 6th (his fur is rabbit like, and frontline doesn't work well on him) I vaccuum the house, then get rid of the vaccuum bag - cause eggs hatch, and then fleas just jump right out of the bag. Once you use a topical product on your cat, they are protected after 24 hours. (less time for some) and any flea that jumps on it will get it on them, and it works on their nervous systems, so they will become more active before dying. a lot of people say once they use frontline they see more fleas - which is true, but they are dying fleas, which is good. Do NOT use any OTC topical treatment on your cats. … [cont.]
Answered by Connie S - Wed Apr 9 12:03:19 2008

How do we know that the solution to the electromagnetic wave equation is sinusoidal?
Q. Since the equation is in the form of d^2u/dx^2 = c^2 * d^2u/dt^2, which has the general solution u = F(x-ct) + G(x+ct), how do we know that the solution is sinusoidal?
Asked by Meep - Sat Nov 24 10:43:32 2007 - - 3 Answers - 0 Comments

A. it isn't necessarily sinusoidal. As you have stated, the solution is any function of x +- ct. Sinusoidal functions, however, are the eigenfunctions of the equation.
Answered by ZikZak - Sat Nov 24 11:24:05 2007

What is the pH of a solution that appears completely yellow or blue?
Q. For most people, when the concentration of one form of an indicator is 10 times greater than the other form, the color will be observed to be that of the form in excess. Given that the Ka of bromocresol green is 2.5*10^-5. A. What is the pH of a solution that appears to be completely yellow? B. What is the pH of a solution that appears completely blue?
Asked by sophie.laureano - Sun Nov 2 20:08:52 2008 - - 1 Answers - 0 Comments

A. Given Ka, you can set up an equation for the indicator, if you represent its dissociation by the following equilibrium reaction: HA <=> H+ + A- where HA is the indicator in one form, and A- is the indicator in the other form then Ka = 2.5 x 10(-5) = [H+]*[A-]/[HA] You can solve this equation for [H+] to get: [H+] = 2.5x10^(-5)*[HA]/[A-], and solve for the two cases involved. The first case ([HA]=10*[A-] would be: [H+] = 2.5x10^(-5)*((10*[A-])/[A -]) = 2.5 x 10-4 so pH = -log([H+]) = -log(2.5x10^(-4)) = 3.6 For the second case ([A-] = 10*[HA]) you get: [H+] = 2.5x10^(-5)*(([HA])/(10*[ HA]) = 2.5 x 10-6 so pH = -log([H+]) = -log(2.5x10^(-6)) = 5.6 Now the only trick is figuring out which color the indicator is on the more… [cont.]
Answered by sfgrc - Tue Nov 4 15:24:18 2008

What is a solution to body image in the media?
Q. Other than teaching kids that models and actors are depicting a false reality and teaching them that its great to be an individual... I need one more solution.
Asked by Jessinka - Mon Nov 17 05:25:06 2008 - - 1 Answers - 0 Comments

A. My solution is to encourage people to stop listening/logging on/watching the media that spreads these unhelpful body image lies...
Answered by Ego Fatigo - Mon Nov 17 10:45:58 2008

What volume of a solution would have to be added to the acidic solution to neutralize completely?
Q. An acid solution is 0.120M in HCl and 0.190M in H2SO4 . What volume of a 0.150M KOH solution would have to be added to 550.0mL of the acidic solution to neutralize completely all of the acid?
Asked by Jaja - Sun Oct 11 12:01:23 2009 - - 2 Answers - 0 Comments

A. moles HCl = 0.120 M x 0.550 L=0.0660 moles H2SO4 = 0.190 M x 0.550 L=0.105 total moles H+ = 0.0660 + ( 2 x 0.105)=0.276 moles KOH required = 0.276 Volume KOH = 0.276 mol/ 0.150 M=1.84 L
Answered by Dr.A - Sun Oct 11 12:07:05 2009

How to decrease and increase the concentration of a solution?
Q. How can you decrease the concentration of a solution??? would adding more tap water to the solution while not changing any other factor do it? and how can you increase the concentration of a solution?? would adding FeSO4 instead of Oxalic Acid do it? thanks alot
Asked by Greg - Tue Mar 4 19:02:35 2008 - - 1 Answers - 0 Comments

A. You can decrease or increase the concentration of a specific solution by adding less or more solutes, respectively, OR increase or decrease water, respectively. Adding more tap water to the solution dilutes it, which indeed decreases the concentration. And yes, adding more solutes such as FeSO4 and oxalic acid will increase the concentration of their respective solutions. (adding more FeSO4 to an oxalic acid solution will not increase its concentration, but adding more oxalic acid to an oxalic acid solution will increase its concentration)
Answered by unknown - Tue Mar 4 19:06:10 2008

How often should I replace the solution in my contacts case for my hard gas permeable contact lenses?
Q. I have hard gas permeable contact lenses and would like to know how often I should change the solution in my contacts case. Also, when applying the contacts and taking them off, should I put some solution on my contacts?
Asked by SJ - Tue Aug 8 22:13:19 2006 - - 2 Answers - 0 Comments

A. You should replace the solution every time you remove the contacts from your eyes and place them in their container. Re-using your solution leads to contamination and eye infections. Using or not using solution during insertion is a personal choice. I do not because I have naturally moist corneas and, if I use solution before insertion, my lens will slide down to the bottom of my eye! You have to determine what works best for you. If you get dry, itchy eyes, you will definitely want to add that drop of solution to your lens before insertion. When removing your lenses, it is recommended that you put a drop of solution in your hand on one on your lenses, then rub the lens' surfaces for 10 seconds to remove the deposits before storing… [cont.]
Answered by ilse72 - Mon Aug 14 19:33:19 2006

What is the best contact lens solution to use for sensitive eyes?
Q. I use disposable soft lenses and change them monthly as recommended. I love wearing contacts, but I have a lot of trouble with my eyes getting dry and irritated. I've been using Renu Moisture Solution and it hasn't made a difference. Any suggestions on a solution that may help?
Asked by Sara L - Wed Jun 27 18:21:53 2007 - - 7 Answers - 1 Comments

A. My recommendation would be Clear Care based on the following studies: - AQuify looks good. Unfortunately, according to one 1995 study, the polyhexanide has no anti-acanthamoebic activity below .0005%. - ReNu's active ingredient (polyaminopropyl biguanide) as well as Opti-Free's (polyquaternium-1) were cited in another 1995 study as completely ineffective against acanthamoeba trophozoites and cysts. That only leaves peroxide systems as an option for soft contact lens wearers. - "Neutralized AOSept, SOLO-Care Soft, and complete comfort Plus were noncytotoxic by all four tests. ReNu MultiPlus and ReNu MPS inhibited the growth of cells after exposure. OPTI-FREE Express (with ALDOX) may have a higher potential for ocular irritation correlating… [cont.]
Answered by eshinee - Fri Jun 29 12:57:23 2007

How do you determine whether a solution is aqueous or organic if it is unknown through a simple test?
Q. A student loses track of whether a beaker contains an aqueous solution or organic solution during an extraction experiment. How do you figure out which it is with a SIMPLE experiment?
Asked by Courtney C - Sat Oct 3 16:24:05 2009 - - 1 Answers - 0 Comments

A. No one has answered this one, Oh dear! You take a small test tube and add ~1mL of H2O to it. Your then take a single drop (disposable pipet) of one of the unknown solutions and add it to the water. If the drop is miscible with water then it is from the aqueous phase; if it sinks to the bottom (or floats) it is the organic layer. Continue with experiment.
Answered by CisRu - Sat Oct 3 23:48:35 2009