precipitation

Solid Na2SO4 is added to a solution that contains 0.150 M Ba 2+ and 0.0800 M Ca2+. Which sulfate precipitates first, BaSO4 or CaSO4? What calculations would porve this? What shpuld be the concentration of sulfate ion for the best separation?

calculating solubility

calculate solubility of AbBr in 6.0 M NH3. Assume highest complex formed is Ag(NH3)2 +.

molar solubility

calculate molar solubility of CuI in 1.0 M NaI. Assume the highest complex formed is CuI2 - .

pH and precipitation

A 0.10 M Mn 2+ solution is saturated with H2S. At what pH will MnS begin to precipitate? [H2S] sat'd=0.10M

Application of Le Chatelier's principle to the freeze drying process

Use Le Chatelier's principle to explain why low pressure is used in the freeze-drying process- like in the making of instant coffee.

Synthesize and purify a few grams of aspirin.

How do you synthesize and purify a few grams of aspirin? What chemical principles apply if any?

What pressure should she have the balloon filled with helium

Keith wnts a large helium balloon, his mom can only fit 10.0 L in her small car. The temperature outside is 17.0 C. The balloon has a mass of 500 g He. What pressure should she have the balloon filled with helium? a 0.114 kPa b 2.98 104 kPa c 1.95 kPa d 1.14 kPa how to set up the problem - explain in detail (high sc ...continues

pH of a 0.45M solution of sulfurous acid

What is the pH of a 0.45M solution of sulfurous acid ?

Word problem using equations

when hydrochloric acid (hydrogen chloride) is released in the air, the oxygen reacts with it to produce chlorine gas and water. if you use 20.0L oxygen, how much hydrogen chloride(in g)could you react with to use the oxygen? a. 32.6g b. 8.15g c. 4088g d. 130g

electromagnetic waves

At its closest approach, Mars is 56 million km from earth. How long would it take to send a radio message from a space probe of Mars to earth when the planets are at this closest distance?