Equal volumes of three acid solutions of pH 3, 4 and 5 are mixed in a vessel. What will be the $H^+$ ion concentration in the mixture ?

Question

( A ) $1.11\times 10^{–4 }$ M
( B ) $1.11 \times10^{–3}$ M
( C ) $3.7 \times10^{–3}$ M
( D ) $3.7\times 10^{–4}$ M