Name: Reactions of Metal Carbonates with Acids
Uploaded: 2019-07-19
Duration: 4 min 6 s
Description: When substances like metals and liquids like acid react, it produces salt, water, and carbon dioxide. Here, in this video, it has been explained in detail wi...

Question

When Julie tested solutions $" A ", " B ", " C ", " D "$ and $" E "$ " using a universal indicator, she got $pH$ values of $9, 7, 1, 13$ and $6$ respectively. On this basis can you tell which solution-

(a) Is a weak acid

(b) Is a weak base

(c) Is a strong acid

(d) Is a strong base

(e) Is neutral.

Accepted Answer

The $pH$ is a measure of hydrogen ion concentration. The $pH$ scale measures how acidic or basic a substance is. The range goes from $0 - 14$ . For neutral solutions, $pH$ is equal to $7$ . A $pH$ value of less than $7$ shows acidic nature and more than $7$ shows that the solution is basic. Therefore, on the basis of the $" E "$ values given, the solutions can be identified as follows:

(a) The solution $" E "$ has $pH$ value $6$ , so it is a weak acid. A weak acid is an acid that partially breaks apart to give hydrogen ions in an aqueous solution. Generally, all organic acids are weak acids.

(b) The solution $" A "$ has a $pH$ value $9$ , so it is a weak base. A weak base is a base that partially breaks apart to give hydroxide ions in an aqueous solution.

(c) The solution $" C "$ has a $pH$ value of $1$ , so it is a strong acid. An acid that dissociates completely in water to produce hydrogen ions is called a strong acid. Generally, mineral acids are strong acids.

(d) The solution $" D "$ has a $pH$ value of $13$ , so it is a strong base. A base that dissociates completely in water to produce hydroxide ions is called a strong base. Common examples of strong bases include hydroxides of alkali metals and alkaline earth metals, like $NaOH$ and $Ca (OH)_{2}$ .

(e) The solution $" B "$ has a $pH$ value of $7$ , so it is a neutral solution. It is neither acidic nor basic. Neutral solutions do not change the colour of any indicator.

Important Questions on Acids, Bases and Salts

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When Julie tested solutions "A", "B", "C", "D" and "E"" using a universal indicator, she got pH values of 9,7,1,13 and 6 respectively. On this basis can you tell which solution- (a) Is a weak acid (b) Is a weak base (c) Is a strong acid (d) Is a strong base (e) Is neutral.

Important Questions on Acids, Bases and Salts

Learn and Prepare for any exam you want !