# QUESTION 2 If the solubility of copper(II) iodate Cu(IO3)2 is reported as 0.12 g per 100 mL, what is the solubility product constant for this salt?  A.  9.8 × 10-8  B.  8.6 × 10-7  C.  7.3 × 10-6  D.  6.4 × 10-5 QUESTION 3What is the minimum pH at which cobalt(II) hydroxide [Ksp = 2.0 × 10^-16] will precipitate from a solution 0.020 M in Co2+?  A.  5.8  B.  6.2   C.  7.0  D.  7.8

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### QUESTION 2

If the solubility of copper(II) iodate Cu(IO3)2 is reported as 0.12 g per 100 mL, what is the solubility product constant for this salt?

 A.  9.8 × 10-8 B.  8.6 × 10-7 C.  7.3 × 10-6 D.  6.4 × 10-5

QUESTION 3

What is the minimum pH at which cobalt(II) hydroxide [Ksp = 2.0 × 10^-16] will precipitate from a solution 0.020 M in Co2+?

 A.  5.8 B.  6.2 C.  7.0 D.  7.8

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Step 1

Question :2

The molar mass of Cu(IO3)2 = Cu (63.6) + 2 I (2 x 126.9) + 6 O (6 x 16.0) = 413.4 g/mole.

Moles of copper iodate can be calculated as

Step 2

Cu(IO3)2 dissolves to give 1 mole of Cu2+ and 2 moles of IO3-.

So, moles Cu2+ = 2.90 x 10-4 moles and moles IO3- = 5.80 x 10-4 moles IO3-

Molarity = moles/L

Step 3

The solubility product ca...

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