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A scientist observes that after mixing a solid powder into water, the pH of the newly formed solution is 2.7. What can he infer from this observation?


The solution contains an indicator that has a pH of 2.7.


The solid powder contained hydrogen ions.


The pH indicator was used incorrectly.


The powder increased the hydrogen ion concentration of the solution.

Verified Answer :

Greenleafable

The correct answer is
The powder increased the hydrogen ion concentration of the solution.

This means that the powder turned water into a more acidic substance since water's pH factor is 7, and things under 7 are acids.

Answer: The correct answer is' The powder increased the hydrogen ion concentration of the solution'.

Explanation:

The pH abbreviated as power of hydrogen is defined as negative logarithm of \(H^+\) ion in the solution.

\(pH=-\log[H^+]\)

\(2.7=-\log[H^+]\)

\([H^+]=0.00199 M\)

Whereas \(H^+\) concentration in impure water is \(1\times 10^{-7 M\)

The solution with pH value 2.7 was formed when solid powder was mixed into water which means that solid powder has increased the \(H^+\) concentration in the water.

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