5 ml of 1 M HCl, 20 ml of 0.5 M H2SO4, 75 ml of 0.1 M HNO3 are mixed together. What is the molarity of H+ ions in the resulting solution?
0.325 M
0.5 M
0.725 M
1 M
mmoles of HCl = 5 1 = 5
mmoles of H2SO4 = 20 0.5 = 10
mmoles of HNO3 = 75 0.1 = 7.5
Now, HCl and HNO3 are monoprotic acid while H2SO4 is a diprotic acid
mmoles of H+ = 5 + 2 10 + 7.5 = 32.5
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