6. A claim has been made again a commercial rust treatment product containing ch

Question

6. A claim has been made again a commercial rust treatment product containing chloro-acetic (ClAcOH). According to the claim, ClAcOH was replaced with acetic acid (AcOH) which is more cost efficient, but has an inferior performance. You are tasked to determine if the claim is valid. You are provided four solution with concentration listed below. You looked up the acidity constant (Ka) for both acids, and the infinite equivalent conductance (0) (also shown below). Using a conductivity probe you determined the specific conductance () for each solution. Based on your measurement, does the claim hold water? Use both, the infinite equivalent conductance and acidity constant for your argument.

ClAcOH

AcOH

Ka

1.40x10-3

1.80x10-5

L0 (Se-1cm2)

422

390

c (M)

k(S/cm)

1.00E-03

2.83E-04

5.00E-03

8.55E-04

1.00E-02

1.30E-03

5.00E-02

3.23E-03

ClAcOH

AcOH

Ka

1.40x10-3

1.80x10-5

L0 (Se-1cm2)

422

390

Explanation / Answer

The claim of having ClAcOH replaced with acetic acid (AcOH) is true. From the data collected, The higher the conductivity means higher pH. And AcOH is more acidic than ClAcOH. Therefore, it is true that the product has been replaced with AcOH.

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