Following four solution are prepared by mixing different volumes of NaOH and HCI of different concentratoin pH of which one of them will be equal to 1?

Options

A. `100mL M/10 HCl + 100mL M/10 NaOH`
B. `75mL M/5 HCl + 25mL M/5 NaOH`
C. `60mL M/10 HCl + 40mL M/10 NaOH`
D. `55mL M/10 HCl + 45mL M/10 NaOH`

Answer

B

Explanation

`HCl + NaOH to NaCl + H_(2)O`
`75 ml, M//5 25 ml, M//5`
Initially 15 mmoles 5 mmoles
After reaction 10 mmoles 5 mmoles
`therefore [H^(+)]=10/(75+25) = 0.1M implies pH=1`