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lbvjy [14]
3 years ago
11

All the following are signs of a chemical reaction, except

Chemistry
2 answers:
hodyreva [135]3 years ago
8 0
C. a change of state. It can be a physical or a chemical state of change.
kaheart [24]3 years ago
6 0
C. a change of state. 

Signs of a chemical reaction include;
Change of color
formation of gas
change of temperature
Precipitate formation
Energy production.
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What is the classification of a solution of naoh with a ph of 8.3?
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Answer:

  • <u>Alkaline or basic solution </u>(alkaline and basic means the same)

Explanation:

According to the <em>pH</em>,  solutions may be classified as neutral, acidic, or alkaline (basic).

This table shows such classification:

pH               classification

  7                   neutral

> 7                   alkaline or basic

< 7                   acidic

Thus, since the pH of the solution is 8.3, which is greater than 7, the solution is classified as basic (alkaline).

Additionally, you must learn that pH is a logarithmic scale for the concentration of hydronium ions in the solution.

  • pH = - log [H₃O⁺]

You can calculate the concentration of hydronium ions using antilogarithm properties:

pH=-log[H_3O^+]\\ \\ {[H_3O^+]}=10^{-pH}\\ \\ {[H_3O^+]}=10^{-8.3}=0.00000000501

NaOH solutions are alkaline solutions, bases, according to Arrhenius model,  because they contain OH⁻ ions and release them when ionize in water.

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