Question

What is the ph of a saturated solution of cu(oh)2 (ksp = 2.6 x 10-19)?

Answer 1

Answer:

7.90

Explanation:

Cu(OH)

2

⇌Cu

2+

+2OH¯

Ksp=[Cu

2+

][OH¯]

2

1.6×10

−19

=(s)(2s)

2

=4s

3

After dividing by 4 and then taking the cube root:

S=3.42×10

−7

M

[OH¯].That value is '2s.'

[OH¯]=6.84×10

−7

M

pOH=−log6.84×10

−7

=6.165

pH=14−6.165=7.835

Hence the pH value is7.835≈7.9

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