Question

. If ionic product of water is Kw = 10−16 at 4℃ then a solution with pH = 7.5 at 4℃ will​

Answer 1

Answer: kw= 10^-16

Explanation:pH scale strate from zero to 16 neutral Ph is half of 16 =8

Less than 8 pH is acidic.

So pH 7.5 is acidic.

Answer 2

Answer: The solution will turn blue litmus paper to red.

Explanation:

To calculate the pH of the solution, we use the equation:

$pH=-\log[H^+]$

We are given:

$K_w=10^{-16}$

Ionic product of water is defined as the product of hydrogen and hydroxide ions.

So, $[H^+]=10^{-16}M$

Putting values in above equation, we get:

$pH=-\log(10^{-16})\\\\pH=16$

The pH range for this solution will be from 0 to 16.

• If the pH of the solution ranges from 0 to 7.9, then the solution is acidic solution.
• If the pH of the solution ranges from 8.1 to 16, then the solution is basic solution.
• If the pH of the solution is 8, then the solution is neutral solution.

There are 2 types of litmus paper:

• Red litmus paper: This paper will turn blue if it is dipped in basic solution and it remains as such if it is dipped in acidic solution.
• Blue litmus paper: This paper will turn red if it is dipped in acidic solution and remains as such if it is dipped in basic solution.

We are given:

pH of the solution = 7.5

Hence, the solution will turn blue litmus paper to red.