Aswimming-pool worker wants the pool's ph to be 7.2. she comes by to test the water and finds that the ph is 9.2. what should she do to correct this situation?

a. add water.

b. add base.

c. add acid.

d. do nothing.

Answer : The correct option is, (C) Add acid.

Explanation :

As we know that, the pH measures the acidity and basicity of a substance.

The pH range for acidic solution is, 0.1 to 6.9

The pH range for basic solution is, 7.1 to 14

For neutral solution the pH is, 7

As per question, the worker wants the pH of the swimming pool is, 7.2 that means slightly basic. But by testing the water, she found that the pH is, 9.2 that means highly basic. So, to correct the pH of swimming pool that is 7.2 she should add an acid into the water to overcome the basicity of the water.

Hence, the correct option is, (C) Add acid.

The correct answer is option C.

Explanation:

The pH of the solution is negative logarithm of hydrogen ion concentration in the aqueous solution.

The pH of the pool = 9.2

The pH of the pool desired by worker = 7.2

Hydrogen ion needed tom vahnge pH of the pool from 9.2 to 7.2 is

:

For hydrogen ions worker has to add acid which will give hydrogen ion in its aqueous from. Hence, correct answer is option C.

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

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explanation:

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