Acids and Bases Worksheet NAME__________________ 1. Name the following compounds as acids and circle which are weak acids: a) HNO3 b) H2SO4 c) HF d) H2CO3 e) HC2H3O2 f) H3PO4 2. Write the formulas for the following bases: a) calcium hydroxide b) aluminum hydroxide c) ammonium hydroxide d) lithium hydroxide 3. Complete the following table: Acids Bases Definition Electrolyte in aqueous solution? pH Taste Litmus turns Which reacts with metals to form H2 gas? Conjugate acid-base pairs 4. Identify the acid, the base, the conjugate acid and the conjugate base in the reaction: NH3 (g) + HOH (l) ⇄ NH4+(aq) + OH-(aq) 5. Identify the acid, the base, the conjugate acid and the conjugate base in the reaction: HCO3 -(aq) + HOH (l) ⇄ CO3 2-(aq) + H3O+ (aq) 6. An acid will form the conjugate ______and a base will form the conjugate _______. Neutralization and Titration. 7. Classify the following acids as monoprotic, diprotic or triprotic: a) H2SO4 b) H3PO4 c) HCl d) HC2H3O2 or CH3COOH (same thing) 8. What is the concentration of an unknown NaOH solution if took an average of 15.4mL of 0.100N HCl solution to neutralize 10.0mL of the NaOH solution? 9. From the given data, what is the molarity and the normality of the HF solution if the KOH solution was 0.50M? Acid, Base, HF KOH Initial Volume, mL 5.5 14.9 Final Volume, mL 25.9 24.4 pH = - log[H3O+] To find pH if given [H3O+], enter the [H3O+], press Log & then the -/+ button To find [H3O+] if given pH, enter negative pH, then 2nd function Log 10.A solution has a [H3O+] of 1 X 10-7. M, what is its pH?____Is this an acid, base or is it neutral? TURN THE PAPER OVER 11. What is the pH of a solution if the [H+] = 7.2 X 10-9M?_____ Is this an acid or base? 12. If the hydronium ion concentration is 2.5 X 10-4, what is the pH?______ Is this an acid or base? 13. If the pH of a solution is 0.8, what is its hydronium ion concentration?___________ 14 If the hydrogen ion concentration is 10-8, what is the pH? _________ Is this an acid or base? 15. What is the pH of a 1.0 M HCl solution?______ Would this turn litmus paper red or blue? 16. What is the pH of a solution with a [H3O+] of 1 X 10-9M? ________ it’d taste sour or bitter? 17. What is the pH of a solution if the [OH-] = 2 X 10-5M? (Hint: first find [H3O+] ) __________ Kw = [H3O+][OH-] = 1.0 X 10-14 and pH + POH = 14 + 18. If the [H ] of a solution is 2.5 X 10-4M, what is the concentration of the hydroxide ion?_____ Is this solution an acid or a base? 19. If the [OH-] of a solution is 1 X 10-6M, what is the concentration of the hydronium ion?_________ Is this solution an acid or a base? 20. The pH of orange juice is 5, what is the pOH?_____ 21. The pH of grapefruit juice is 4, what is the pOH? ____ 22. What is the concentration of hydrogen ions in a solution if its [OH-] is 2.5 X 10-10M?______ Strengths of acids and bases is determined by degree of ionization and measured by Ka or Kb 23. Identify the strongest acid and the weakest acid among the following: a) H3PO4 with a Ka of 7.5 X10-3 b) acetic acid with a Ka of 1.8 X10-5 c) HF with a Ka of 6.8 X10-4 24. Write the expression for the acid dissociation constant of the strong acid, hydrofluoric acid, HF Hint: First write the balanced chemical equation for the dissociation of HF in water. 25. A 0.10M solution of formic acid, HCOOH, has an equilibrium [H+] = 4.2 X 10-3M What is the Ka of formic acid? The equilibrium is shown below: HCOOH (aq) ⇄ H+ (aq) + HCOO-(aq) 26. The Ka of benzoic acid, C6H5COOH is 6.3 X10-5 for C6H5COOH (aq) + H2O(l) ⇄ H+ (aq) + C6H5COO -(aq) What is the equilibrium [H+] in a 0.20M solution of benzoic acid? 27. A 0.10M solution of nitrous acid, HNO2, has an equilibrium hydrogen ion concentration of 6.7 X10-3M. what is the Ka of nitrous acid?