1. Tardigrade
  2. Question
  3. Chemistry
  4. The pH value of HCl(10-12M) is

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. The $ pH $ value of $ HCl({{10}^{-12}}M) $ is

Punjab PMETPunjab PMET 1999

Solution:

We know that $ {{10}^{-12}}M $ solution of $ HCl $ is very dilute. So concentration of $ H $ ions due to self-ionisation of water cannot be neglected. Therefore, $ {{[{{H}^{+}}]}_{total}}={{H}^{+}}[from\,\,HCl+water] $ $ -\log [1.00001\times {{10}^{-7}}]=7. $ We also know that $ pH=-\log [{{H}^{+}}] $ $ =-\log [1.00001\times {{10}^{-7}}]=7 $