Question

Connie was making sodium chloride by adding an acid to an alkali. She followed the progress of the reaction with a pH sensor .What else could she have used to detect when the reaction was complete?

Answer 1

What Connie could have used to detect when the chemical reaction was complete is an: acid-base indicator.

A chemical reaction is a chemical process that involves the continuous rearrangement (transformation) of either the ionic, atomic or molecular structure of a chemical element through the breakdown and formation of chemical bonds, in order to produce a chemical compound.

When a strong acid such as Hydrogen chloride (HCl) react with a strong alkali such as Sodium hydroxide (NaOH), it gives rise to the formation of Sodium chloride (NaCl) and Water ($H_2O$);

                       $HCl + NaOH$ ----> $NaCl + H_2O$

The progress of the above chemical reaction can be followed by using a pH sensor and the final pH of a strong acid and strong base is seven (7), meaning it is neutral.

However, Connie could make use of an acid-base indicator to detect when the chemical reaction is complete.

An acid-base indicator can be defined as a chemical substance that changes color with respect to the pH (hydrogen ion concentration) of a solution or chemical reaction. Some examples of an acid-base indicator are:

• Litmus paper.

• Methyl red.

• Red cabbage juice.

• Bromothymol blue.

• Methyl orange.

• Phenolphthalein.

In conclusion, an acid-base indicator is typically used for detecting when a chemical reaction between an acid and an alkali is complete.

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