7. Coffee, though essential to a college student, is is the concentration of hydroxide ions in coffee? (Coffee's pH is 5) 8. Coke (the beverage) is highly acidic, with a pH of 2.7! Find the concentration of hydronium ion in 900 ml of Coca-Cola. H30*

Which is a base?   Question 16 options:   KCl   NaCl   HCl   NaOH

Question 11

Ammonia is often used as a glass cleaner. Calculate hydronium concentration of a sample of ammonia that has a pOH of 3.600 You MUST show your work, and then record your final answer with the correct number of significant digits and proper units.

4

A. What is the pH of an aqueous solution with a hydrogen ion concentration of [H+]=7.2×10−5[H+]=7.2×10−5 M?   B. What is the hydroxide ion concentration, [OH−][OH−], in an aqueous solution with a hydrogen ion concentration of [H+]=7.2×10−5[H+]=7.2×10−5 M? C. A monoprotic weak acid, HAHA, dissociates in water according to the reaction HA(aq)↽−−⇀H+(aq)+A−(aq)HA(aq)↽−−⇀H+(aq)+A−(aq) The equilibrium concentrations of the reactants and products are [HA]=0.120 M[HA]=0.120 M, [H+]=3.00×10−4 M[H+]=3.00×10−4 M, and [A−]=3.00 ×10−4 M[A−]=3.00 ×10−4 M. Calculate the ?aKa value for the acid HA.

D Question 8 A solution has a hydrogen ion concentration measured by chemical means. It has a concentration of H+ 3.46 X 106. What is the pH value of the solution?

Each row of the table below describes an aqueous solution at about 25 °C. Complete the table. That is, fill in any missing entries in third column. Be sure each entry you write includes the correct number of significant digits. [1,0] solution pH -7 8.4 x 10 mol/L ? B 0.72 mol/L – 10 mol/L 4.1 x 10

12

- 14 + An aqueous solution at 25 °C has a OH concentration of 3.4 × 10 M. Calculate the H₂O* concentration. Be sure your answer has 2 significant digits. M Dx1 x10 Ś