First slide

PH of strong acids and strong bases

Question

2g of NaOH is dissolved in water to make 1L solution. What is the pH of solution?

Moderate

A

10.25
B

8.256
C

12.69
D

10.89

Solution

Weight of NaOH dissolved = 2g
$∴ Equivalent of NaOH dissolved = \frac{2}{40}$
$N_{NaOH} = \frac{2}{40} = 0.05$
$[OH]^{-} = 0.05 = 5 \times 10^{- 2}$
$pOH = - \log [{OH}^{-}]$
$= - \log (5 \times 10^{- 2}) = 1.3010$
pH+pOH =14
pH =14- pOH = 14- 1.3010= 12.699

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