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How many grams of NaOH must be dissolved...

How many grams of `NaOH` must be dissolved in `1L^(-1)` of the solution to given it a `pH` value of `12`?

A

`0.20 gL^(-1)`

B

`0.40 gL^(-1)`

C

`0.10 gL^(-1)`

D

`1.2 gL^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
`pH = 12, pOH = 2, [overset(Theta)OH] = 10^(-2)M`.
`[overset(Theta)OH] = 10^(-2)M = 10^(-2) xx 40 g L^(-1) = 0.4 gL^(-1)`
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