Self Quiz Answers

1. Which of the following properties would indicate an acid?

I. pH less than 7

II. Turns litmus paper to a blue color.

III. Turns phenolphthalein to a pink color.

*a. I only

b. II only

c. I and II

d. I and III

e. II and III

2. Which of the following reactions would indicate a base?

a. reacts with water to give H₃O⁺

b. reacts with water to give H₂

c. reacts with a metal to give H₂

d. reacts with HCO₃^- to give CO₂

*e. reacts with NH₄⁺ to give NH₃

Answer the following questions in the space provided.

3. Balance this equation and determine whether a precipitate is formed.

CaCl₂ + 2 AgNO₃ ))> 2 AgCl(ppt) + Ca(NO₃)₂

4. Write a complete balanced equation for the reaction between iron(III) chloride and lead(II) nitrate. Is this a precipitation reaction? If so, identify the precipitate.

This is a precipitation reaction and lead(II) chloride is the precipitate.

2 FeCl₃ + 3 Pb(NO₃)₂ ))> 3 PbCl₂(ppt) + 2 Fe(NO₃)₃

5. Write a complete balanced equation for the reaction between ammonium sulfide and copper(II) chloride. Is this a precipitation reaction? If so, identify the precipitate.

This is a precipitation reaction and copper(II) sulfide is the precipitate.

(NH₄)₂S + CuCl₂ ))> CuS(ppt) + 2 NH₄Cl

6. Write formulas for the following chemicals and determine whether they are soluble or insoluble in water.

7. Abbreviated solubility rules:

Results of lab tests:

#1 is basic and precipitates with #3 and #4.

#2 is acidic and precipitates with #3.

#3 precipitates with #1 and #2.

#4 precipitates with #1.

Which chemical is in each bottle?

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E-mail instructor: Eden Francis