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I need help with my chemistry homework :) PART 1.) A buffer solution contains 0.35 mol...

I need help with my chemistry homework :)

PART 1.)

A buffer solution contains 0.35 mol of hydrogen peroxide (HOOH) and 0.50 mol of sodium hydrogen peroxide (NaOOH) in 3.60 L.
The Ka of hydrogen peroxide (HOOH) is Ka = 2.4e-12.
(a) What is the pH of this buffer?
pH = _____
(b) What is the pH of the buffer after the addition of 0.31 mol of NaOH? (assume no volume change)
pH = ______
(c) What is the pH of the original buffer after the addition of 0.07 mol of HI? (assume no volume change)
pH = ______

PART 2.)

(a) If the molar solubility of Ag2CO3 at 25 oC is 0.000128 mol/L, what is the Ksp at this temperature?
Ksp = ______
(b) It is found that 8.90e-06 g of Y2(CO3)3 dissolves per 100 mL of aqueous solution at 25 oC. Calculate the solubility-product constant for Y2(CO3)3.
Ksp = ______
(c) The Ksp of Ag3AsO4 at 25 oC is 1.03e-22. What is the molar solubility of Ag3AsO4?
solubility = ________ mol/L

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