IOQJS problem - 1

Chemistry Level 2

$620g$ of $\ce {H3BO3}$ is dissolved in 50 litres of heavy water . If 50% of $\ce {H3BO3}$ is ionized and the pH of solution is $P$ and mass of $\ce{H+}$ ion present in solution $Q$ ,then find P+Q

Molecular weight of $\ce {H3BO3}$ is 62 amu.

Enter answer as nearest integer