7.42 The pH of a sample of vinegar is 3.76. Calculate the concentration of hydrogen ion in it.

Given, pH
= 3.76
It is known that,

pH=-logH+logH+=-pHH+=antilog-pH              =antilog-3.76              =1.74×10-4M

Hence, the concentration of hydrogen ion in the given sample of vinegar is 1.74×10-4M