A student took the following samples to find out their pH using pH paper. The teacher remarked that one of the samples taken was not proper.The teacher was referring to- a. dilute hydrochloric acid b.lemon juice c.washing soda d. soap solution
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From the samples what student has collected to test the pH value , washing soda is wrong selection.
Because pH paper acts as indicators when substances are aqueous solution.
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Answer: (c) Washing soda.
Explanation:
a. Dilute hydrochloric acid: It is a liquid. The pH of this solution is 6.98 where it is an acidic solution.
b. Lemon juice: It is a liquid. The pH of this solution is 2.0 where it a highly acidic solution.
c. Washing soda: It is a solid. It is white inorganic salt which is alkaline in nature.
d. Soap solution: It is a liquid, the pH of this solution is around 9 which is basic solution.
Illustration:
Since, washing soda is in solid form where pH paper cannot be used to find its strength. The pH paper is only used if they are liquid.
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