UB CHE 102LEC - Test_3_Review (5 pages)

Previewing pages 1, 2 of 5 page document View the full content.
View Full Document

Test_3_Review



Previewing pages 1, 2 of actual document.

View the full content.
View Full Document
View Full Document

Test_3_Review

9 views


Pages:
5
School:
University at Buffalo-SUNY
Course:
Che 102lec - General Chemistry Lecture
General Chemistry Lecture Documents

Unformatted text preview:

Chemistry 102 REVIEW QUESTIONS TEST 3 1 Calculate the pH of a solution containing 0 100 M sodium formate NaHCO2 and 0 180 M formic acid HCHO2 Ka formic acid 1 8x10 4 2 A buffer is prepared by adding 5 00 g of NH3 and 20 0 g of NH4Cl to enough water to form 2 50 L of solution a Calculate the pH of this buffer b Calculate the pH of the solution when 0 200 g of NaOH is added to 1 50 L of this buffer Chemistry 102 3 Will Mn OH 2 precipitate from solution if the pH of a 0 050 M solution of MnCl2 is adjusted to 8 00 Ksp of manganese hydroxide is 1 9x10 13 4 Calculate the Cu2 in 1 0 L of a solution that contains 1 0x10 3 mole of Cu NO3 2 and that is 0 10 M in NH3 Kf for Cu NH3 42 5 0x1012 5 Consider the titration of 25 0 mL of 0 0800 M H2CO3 with 0 100 M KOH Calculate the pH of the solution after a addition of 10 0 mL of base and b at equivalence point Ka for carbonic acid 4 3x10 7 Chemistry 102 6 A 0 229 g sample of an unknown monoprotic acid is titrated with 0 112 M NaOH The resulting titration curve is shown below Based on this information determine the molar mass and the Ka of the acid 7 Calculate the solubility of Au OH 3 in 1 0 M nitric acid solution Ksp 5 5x10 46 Is this value greater or less than the solubility in pure water Explain Chemistry 102 8 A 0 25 mol sample of a weak acid with an unknown pKa was combined with 10 0 mL of 3 00 M KOH and the resulting solution was diluted to 1 500 L The measured pH of the final solution was 3 85 What is the pKa of the weak acid 9 A solution consists of 0 050 M Mg2 and 0 020 M Cu2 a Which ion will precipitate first as OH is added to the solution b What concentration of OH is necessary to begin the precipitation of each cation Ksp for Mg OH 2 1 8x10 11 and Ksp for Cu OH 2 2 2x10 20 10 Calculate the solubility of CuX in a solution that is 0 150 M in NaCN Ksp for CuX 1 27x10 36 Kf for Cu CN 42 1 0x1025 Chemistry 102 ANSWERS 1 pH 3 48 2 a pH 9 15 b pH 9 17 3 No precipitation occurs 4 Cu2 2 4x10 12 M 5 a pH 6 37 b pH 9 50 6 molar



View Full Document

Access the best Study Guides, Lecture Notes and Practice Exams

Loading Unlocking...
Login

Join to view Test_3_Review and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Test_3_Review and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?