Question

A solution of HCl with a concentration of 4X10-4 mol L-1 has a pH of
which of the following?
2.67
3.21
3.40
4.31

Answer 1

Answer:

3.40

Explanation:

Therefore 4*0.0004 = 0.00016M is the conc. of H+ Ions

The pH of the solution is defined as the negative logarithm of the hydrogen ion concentration (-log [H+]), which is 3.397 or 3.40

Answer 2

Given:

A solution of HCl with a concentration of $4×10^{-4}$ mol L-1.

To find:

We have to find the pH of the solution.

Solution:

To determine the pH of $4×10^{-4}$ mol/lt HCl solution we have to follow the below steps as follows-

HCl in solution dissociates as-

$HCl\rightarrow H^++Cl^-$.

Here the concentration of hydrogen ion is $4×10^{-4}$.

We know that

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

Let the value of pH be x.

So, we can write-

$x = - log(4 \times {10}^{ - 4} ) \\ x = 3.40$

The value of x is 3.40.

Hence the pH of the solution is 3.40.