The pH value of a neutral solution is 7.
(i) What is the pH value of an alkaline solution? Less than 7 or greater than 7.
(ii) What is the pH value of an acidic solution? Less than or greater than 7.

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Solution

1. pH
pH stands for the potential of hydrogen. The pH scale ranges from 0 to 14 and based on this pH value solutions are differetiated.
Substances having pH between 0 to 6 are acids.
Substances having pH values between 8 to 14 are bases.
Neutral solutions have a pH value of 7.
2. Explanation for pH values
(i) The pH value of an alkaline solution is more significant than seven because bases have a pH ranging from 8 to 14. Thus, the pH value of an alkaline solution is greater than 7.
(ii) On the other hand, the pH value is fixed from 0 to 6 for an acidic solution. Thus, the pH value of an acidic solution is less than 7.

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Q. Fill in the following blanks with suitable words:
(a) Acids have a pH...........than 7.
(b) Alkalis have a pH.............. than 7.
(c) Neutral substances have a pH of ................
(d) The more acidic a solution, the ................. the pH.
(e) The more alkaline a solution, the............... the pH.

Give one example each of a salt which gives an aqueous solution having :

(a) pH less than 7

(b) pH equal to 7

If a solution changes the color of litmus from red to blue, what can you say about its pH value/less than 7 or greater than 7?

p H

value is greater than 7 for the aqueous solution of:

(a) What do you think is the pH in the stomach of a person suffering from indigestion? Is it less than 7 or more than 7?

(b) What do you think is the pH of an antacid solution? Is it less than 7 or more than 7?

(d) Name two common antacids.

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The pH value of a neutral solution is 7.(i) What is the pH value of an alkaline solution? Less than 7 or greater than 7.(ii) What is the pH value of an acidic solution? Less than or greater than 7.

The pH value of a neutral solution is 7.
(i) What is the pH value of an alkaline solution? Less than 7 or greater than 7.
(ii) What is the pH value of an acidic solution? Less than or greater than 7.