nitrogen forms five compounds with oxygen in which 2.5g of nitrogen combines with 1.43,2.85,4.33,5.70 and 7.13g of oxygen respectively. show that these figures agree with law of multiple proportion

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.