Question

Indicator Low pH color Transition pH range High pH color Thymol blue (first transtion) Red 1.2...

Indicator

Low pH color

Transition pH range

High pH color

Thymol blue (first transtion)

Red

1.2 - 2.8

Yellow

Methyl red

Red

4.4 - 6.2

Yellow

Bromothymol blue

Yellow

6.0 - 7.6

Blue

Thymol blue (second transition)

Yellow

8.0 - 9.6

Blue

Phenolphthalien

Colorless

8.3 - 10.0

Fuchsia

1. Select all of the following statements that are true about the universal indicator used in this experiment

A.The universal indicator is a single chemical compound.

B. At pH 1.2 the indicator will be red.

C. The universal indicator (or parts thereof) are in equilibrium and have an associated K value.

D. At pH 7 the indicator will be colorless.

2. Currently this lab is run qualitatively asking only for whether a solution is acidic, neutral, or basic. If quantitative information was to be acquired for this experiment, what range of pHs would the universal indicator described in your lab manual be unable to distinguish?

A. 7.6-8.0

B

7.0

C.

8.0-8.6

D.

6.0-7.6

3.. Select all ions that are produced when NaCl is dissolved in water?

A.

Na+

B.

Cl-

C.

Na-

D.

Cl+

4.. Select all ions that are produced when CaCl2 is dissolved in water?

A

Cl+

B.

Ca2-

C.

Cl-

D.

Ca2+

5. Select all ions that are produced when NaCH3COO is dissolved in water?

A.

CO2

B.

H+

C.

CH3COO-

D.

Na+

E.

NO3-

F.

CH3-

6. Select all ions that are produced when Na2CO3 is dissolved in water?

A.Na+

B.CO32-

C. O-

D. Na2+

E. CO3-

F. CO2

7. The products of the reaction between a strong acid and a strong base are water and a “salt”. Which “salt” is the product of the following reaction? HNO3 (aq) + KOH (aq) → H2O (aq) + “salt” (aq)

A.

K2O

B.

KNO2

C.

KO4H

D.

KNO3

8. A neutralization reaction occurs and produces a “salt” and water. Select the two reactants that would produce SrI2and H2O when combined:

A. HSr

B. SrO

C. SrOH

D. SrI

E. HI

F. Sr(OH)2

Review Part B in the experimental procedure. A control experiment allows you to study only a single component in a multi-component system.

9. Which of the following solids create the best control experiment if you were testing the acid/base properties of CATIONS?
(Choose Only 3)

A. CaCl2

C. NaCl

D. SrCl2

E. NaHCO3

F.NaCH3COO

G. Ca(OH)2

Review Part C in the experimental procedure

10. Which of the following solids create the best control experiment if you were testing the acid/base properties of ANIONS?
(Choose Only 3)

A.

CuCl2

B.

Tris-HCl

C.

K2CO3

D.

K3PO4

E.

KCH3COO

F.

NH4Cl
Engineering   Chemical-Engineering   
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Homework Answers

Answer #1

1. The universal indicator is not a single chemical compound, but a mixture of all the mentioned indicators. At pH it will be green or greenish blue in color as indicated by the color in range 6.2 to 7.6.

At pH 1.2 it will be red. Hence, option B is correct.

2. Since there is no indicator for the range of 7.6 to 8.0, the indicator will be unable to disti8distithis range. Option A is correct.

3. NaCl(s) Na+(aq) + Cl-(aq) Option A and B are correct.

4. CaCl2(s) Ca2+(aq) + 2Cl-(aq) Option C and D are correct.

5. CH3COONa(aq) CH3COO- + Na+ Option C and D are correct.

6. Na2CO3 2Na+ + CO3 2- Option A and B are correct.

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