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Q.

A solution of an acid has pH = 4.70. Find out the concentration of OH- ions (pKw =14).

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a

5×10-10

b

6×10-10

c

2×10-5

d

9×10-5

answer is A.

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Detailed Solution

pH+pOH=pKwpOH=14-4.7=9.3pOH=-logOH-=9.3OH-=anti log 9.3               =5×10-10
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