1. Calculate the following for the given aqueous solutions at 25 degrees celsius
ID: 522225 • Letter: 1
Question
1. Calculate the following for the given aqueous solutions at 25 degrees celsius
a. the [OH-] concentration of a Sr(OH)2 solution whose pH is 13.55
b. the pH of a 2.225 M Ba(OH)2 solution
2. At 25 degrees Celsius what would be the pH of 50.00 mL of an aqueous 0.250 M lactic acid (monoprotic) solution that has had 26.25 mL of 0.200 M KOH added to it? The Ka of lactic acid = 1.38 x 10^-4
3. Calculate the Ksp of Ca3(PO4)2 at 20.0 degrees Celsius if its Molar Solubility is known to be 1.10 x 10^-7 M at this temperature
4. What is the solubility of vanadium (III) hydroxide (MM= 101.963 g/mol) in g/100 mL at 20 degrees Celsius. The Ksp of V(OH)3 = 4.10 x 10^ -35 at this temperature
Explanation / Answer
1)
a) pH = 13.55
pH + pOH =14
pOH = 0.45
[OH-] = 10^-pOH
[OH-] = 10^-0.45
[OH-] = 0.355 M
b)
2.225 M Ba(OH)2
[OH-] = 2 x 2.225 = 4.45 M
pOH = -log [OH-]
pOH = 0.648
pH + pOH = 14
pH = 13.35
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