University:
Glendale Community College
Course:
CHM130 | Fundamental Chemistry
Academic year:

2021
Views:

200

Pages:

1
Author:

heidinne7m

Answers: 1. Name 3 strong acids and write their formulas. What makes an acid strong? hydrochloric acid HCl, nitric acid HNO3, sulfuric acid H2SO4. Strong means 100% ionized, all the H+ ions have broken off the acid molecule in water. It exists as all ions. 2. Name 4 weak acids and write their formulas. What makes an acid weak? hydrofluoric acid HF, phosphoric acid H3PO4, carbonic acid H2CO3, acetic acid HC2H3O2 Weak means very little ionized like 1-5%. Few H+ ions have come off the acid molecule in water. Few ions 3. Name 2 strong bases and write their formulas. What makes a base strong? potassium hydroxide KOH, sodium hydroxide NaOH. Strong means 100% dissociated, all the OH- ions have broken off the base in water. It exists as all ions. 4. Name 1 weak base and write its formula. What makes a base weak? magnesium hydroxide Mg(OH)2. Weak means 1-5% dissociated. Few ions. Most stays together. 5. Identify the Arrhenius acid and base in the following reactions: a. HNO3 (aq) + KOH(aq)  H2O(l) + LiNO3(aq) acid base b. 2 HBr(aq) + Ca(OH)2(aq)  2 H2O(l) + CaBr2(aq) acid base c. HC2H3O2(aq) + LiOH(aq)  H2O(l) + LiC2H3O2(aq) acid base 6. What is the pH for these solutions? Is the solution acidic, basic, or neutral? a. [H+] = 10-9 pH = ____9____ basic b. [H+] = 10-4 pH = ____4____ acidic c. [H+] = 0.0001 pH = ____4____acidic + d. [H ] = 0.0000000001 pH = ____10____basic 7. What is the definition of a buffer solution? A solution that keeps pH constant, resists a change in pH. 8. Identify the Bronsted Lowry acid and base in the following reactions: a. NH3(aq) + HClO4(aq)  NH4+(aq) + ClO4-(aq) base acid b. HCl(aq) + CH3NH2(aq)  Cl-(aq) + CH3NH3+(aq) acid base 9. Draw a picture of the following in beakers of water: NaBr, Mg(OH)2, K2S, HNO3, and HC2H3O2. 10. Are the following strong, weak, or non-electrolytes? PbSO4 weak f. CH3OH non a. Al2(SO4)3 strong g. K2CrO4 strong b. c. C6H12O6 non h. Ni(NO3)3 strong d. SrI2 strong i. Ba(C2H3O2)2 strong e. Cu(OH)2 weak j. Ca3(PO4)2 weak