Question

The concentration of hydrogen ion in a sample of soft drink is $3.8 \times 10^{-3}$ M. What is its pH ?

Answer 1

"The "pH of a solution" is the "negative logarithm" of the "hydrogen ion concentration".

The pH may be represented "mathematically" with the "following equation".

$pH\quad =\quad -log[{ H }^{ + }]$

From the given,

The hydronium ion concentration $=\quad 3.8\quad \times \quad { 10 }^{ -3 }$

${ P }^{ H }\quad =\quad log[{ H }_{ 3 }{ O }^{ + }]$

$=\quad log3.8\quad \times \quad { 10 }^{ -3 }$

$=\quad -(-3)log10\quad -\quad log3.8$

$=\quad 3.0\quad -\quad 0.5798\quad [Since\quad log10=1]$

${ P }^{ H }\quad =\quad 2.42$"

Answer 2

$\huge\boxed{\underline{\mathcal{\red{A}\green{N}\pink{S}\orange{W}\blue{E}\purple{R}}}}$

❤..pH= -${log[3.8×10^-3]}$

= _ ${{log[3.8]+log[10^-3]}}$

_ ${{(0.58)+(-3.0)} = -{_2.42} =2.42}$

Therefore, the PH of the soft drink is2.42 and it can be inferred that is acidic .