Question

Please help... please don't answerif you don't know how to solve this problem. I need step by stepanswer as the problem asks. I don't know where to start I neversolved those kinds of problems. Thanks a lot I appreciate yourhelp...

Hydrogen peroxide (H₂O₂) behaves like anacid in water. It has a K_a value equal to 1.778x10^-12. When sold in stores, solutions ofH₂O₂are often 3.00%H₂O₂ by mass. The solutions also contain asmall amount of phosphoric acid (0.001% by mass) which stabilizesthe solution as hydrogen peroxide easily decomposes. Since bothhydrogen peroxide and phosphoric acid behave like acids in water,both acids will contribute H⁺ ions to the solution. TheK_a for phosphoric acid is equal to 7.2 x10^-3. Which acid contributes a larger concentration ofH₃O⁺ions into the solution if you assume 1.00L (HINT: assume the density of the solution is 1.000 g/ml). The twoequations that you will need are given below:

H₂O_{2 (aq)} + H₂O _(l) H₃O⁺¹_(aq) +HO₂^-1_(aq)

H₃PO_{4 (aq)} + H₂O_(l) H₃O⁺¹_(aq) + H₂PO₄^-1_(aq)