A solution of a pH of 4 has 10 times the concentrations of H+ present compared to a solution with a pH of 5, where; pH = - log [H+], the concentration of H+ of pH=4 is: [H+] = anti Log (- pH) = 10 ^ - pH = 10 ^ - 4 = 0.0001 M >>>>> (1) the concentration of H+ of pH = 5 is 10^ -5 = 0.00001 M >>>>> (2) So, (1) more than (2) by 10 times
when the equation is balanced, 2 moles of sodium is to 1 mole of hydrogen in the mole ratio so we need to find how many moles of sodium will produce hydrogen then we cross multiply
