First slide

PH of strong acids and strong bases

Question

The pH of HCl is 1. The amount of NaOH to be added to 100 ml of such a HCl solution to get pH of 7 is

Moderate

A

4g
B

0.4g
C

4 mg
D

0.4 mg

Solution

for a neutral solution $n_{H^{+}} = n_{{OH}^{-}}$
⇒ 10^-1 x 100 x 10^-3 = 10^-2
n_{NaOH =} 10^-2
m_NaOH= 40 x 10^-2g = 0.40 g

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