Why should distilled water be used when conducting chemical tests?
1 answer:
Explanation:
Water is used in many tests as solvent for dissolving solutes.
No ions, compounds or salts are present in distilled water. Therefore, test result will not be affected by distilled water.
If plain water is used instead of distilled water, the ions or other salts present in plain water, may undergo chemical reaction with the reagent and may affect the test result.
Consider an example,
Concentration of is determined by potassium permanganate using titration method
solution of both and potassium permanganate are made in water.
Potassium permanganate is titrant and is used as titrand.
Concentration of is determined by end point. if the water used for making solution is not distilled, it may affect end point, which results in incorrect determination of concentration of
.
Therefore, distilled should be used for chemical tests.
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Explanation:
Oxidizing agents are defined as the agents which oxidize other substance and itself gets reduced. These agents undergoes reduction reactions.
Reducing agents are defined as the agents which reduces the other substance and itself gets oxidized. These agents undergoes reduction reactions.
When oxidizing agent-A get reduced it changes green to colorless.
When oxidizing agent-B get reduced it changes yellow to colorless.
When oxidizing agent-C get reduced it changes red to colorless.
1) When we added solution C that oxidizing agent-C in solution containing ions changes from red to yellow:
So, in this C is oxidizing ion into B which yellow in color.
C is reduced and ions is oxidized.
Here, are oxidized by C which means that C a better oxidizing agent than B.
2) When a solution of C is mixed with one containing A- ions, the color remains red.
no reaction
As we had observed that no color change was seen on adding substance C to the solution with ions which indicates that C was unable to oxidize
ions. Hence, not a better oxidizing agent than A