Q) My water hardness experiment is wrong? I did hard water, tap water, and soft water experiment. I mixed hard / soft / tap water 5ml + pH buffer 1ml + 3 drops of indicator + EDTA x ml My expectation was, Hard water will need most EDTA, then tap water, then soft water. However, my experiment result was EDTA of hard water : 0.15ml EDTA of tap water : 0.33ml EDTA of soft water : 0.03ml Also, when I mixed soft water 5ml + + pH buffer 1ml + 3 drops of indicator ; without EDTA, it was already purple color. I tried this for 4 time to make color pink, but I couldn't. The number 0.03ml is ml to change 'purple to blue'. Q1) My result of each water's EDTA ml is reasonable? Q2) soft water without EDTA color can be purple?
Q) My water hardness experiment is wrong? I did hard water, tap water, and soft water experiment. I mixed hard / soft / tap water 5ml + pH buffer 1ml + 3 drops of indicator + EDTA x ml My expectation was, Hard water will need most EDTA, then tap water, then soft water. However, my experiment result was EDTA of hard water : 0.15ml EDTA of tap water : 0.33ml EDTA of soft water : 0.03ml Also, when I mixed soft water 5ml + + pH buffer 1ml + 3 drops of indicator ; without EDTA, it was already purple color. I tried this for 4 time to make color pink, but I couldn't. The number 0.03ml is ml to change 'purple to blue'. Q1) My result of each water's EDTA ml is reasonable? Q2) soft water without EDTA color can be purple?
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Q) My water hardness experiment is wrong?
I did hard water, tap water, and soft water experiment.
I mixed
hard / soft / tap water 5ml + pH buffer 1ml + 3 drops of indicator + EDTA x ml
My expectation was,
Hard water will need most EDTA, then tap water, then soft water.
However, my experiment result was
EDTA of hard water : 0.15ml
EDTA of tap water : 0.33ml
EDTA of soft water : 0.03ml
Also, when I mixed soft water 5ml + + pH buffer 1ml + 3 drops of indicator ; without EDTA, it was already purple color.
I tried this for 4 time to make color pink, but I couldn't.
The number 0.03ml is ml to change 'purple to blue'.
Q1) My result of each water's EDTA ml is reasonable?
Q2) soft water without EDTA color can be purple?
Thank you.
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