Now [H+] = 10−7 mole / litre Now 1000 ml contains 10−7 mole H+ 1ml '' ''
10−7
1000
mole H+ 1.33 × 10−7 ml — ''1.33 × 10−17 10 million = 10−7 so, 10 million-th part of 1.33 cm3= 1.33 × 10−7 ml So, no. of H+ ions = 1.33 × 10−17 × NA