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Answer the following question the equation pH = - log [H+]
a) Remember if you are given or need to find Molarity (M) of the acid molecule not [H+], you will need to write the reaction on the Reaction line and do stoichiometry as part of answer.
b) If you are given [H+] or pH and looking for opposite, then you do not need to write a reaction so write N/A on Reaction line
1. What is the pH of a solution with [H+] = 3.2E-1 M ? Reaction: _________________________
2a. What is the [H+] (called hydronium ion concentration) of 4.25E-3 M HNO3 solution (called _________ solution)?
Reaction : __________________________________________________
2b) What is the pH of that solution?
3a. What is the [H+] (called hydronium ion concentration) of 5.25E-5 M H2SO4 solution (called ______________ acid solution)?
Reaction : __________________________________________________
3b) What is the pH of that solution?
4. What is the pH of a 9.02E-8M HCl solution (called _______________________ acid solution).
Reaction : ___________________________________________
Answers:
1) pH = 0.49, No reaction needed
2a) 4.25E-3M, Nitric acid, Reaction 1 HNO3 --> 1 H1+ + 1 NO31-
2b) pH = 2.37 (actually pH = 2.372)
3a) 1.05E-4M, Sulfuric acid, Reaction 1 H2 SO4 --> 2 H1+ + 1 SO42-
3b) pH = 3.97 (actually pH = 3.979)
4) Hydrochloric acid, 1 HCl --> 1 H1+ + 1 Cl1-, pH = 7.04 (actually pH = 7.045)