Question

Calculate the hydrogen ion concentration in the following biological fluids whose $pH$ are given below:
A. Human muscle fluid,$6.83$
B. Human stomach fluid,$1.2$
C. Human blood,$7.38$
D. Human saliva, $6.4$

Answer 1

$pH$ is a very important parameter used in chemistry used to identify the acidity and basicity of any solution .To identify the $pH$ of any solution firstly we have to calculate how many concentrations of hydrogen ions are there. Then by applying negative logarithm to the hydrogen ion concentration gives us the value of $pH$ of the solution.

Complete step by step solution:
From this negative logarithmic approach of hydrogen ion concentration, we can say the logarithmic $pH$ is inversely related to the hydrogen ion concentration. An acidic solution contains a large number of hydrogen ion concentrations so these acidic solutions have low $pH$ value. Similarly, if a solution is basic in nature then it will contain a smaller number of hydrogen ion concentration so these basic solutions will have higher $pH$ value.
So, the formula for the determination of $pH$ will be;
$pH = - \left[ {\log {H^ + }} \right]$
Hence the value of hydrogen ion concentration will be,
$\left[ {{H^ + }} \right] = {10^{ - pH}}$
a. Human muscle fluid, $6.83$
Hence hydrogen ion concentration is$= {10^{ - 6.83}} = 1.48 \times {10^{ - 7}}\,M$
b. Human stomach fluid, $1.2$
Hence hydrogen ion concentration is $= {10^{ - 1.2}} = 6.31 \times {10^{ - 2}}\,M$
c. Human blood, $7.38$
Hence hydrogen ion concentration is $= {10^{ - 7.38}} = 4.169 \times {10^{ - 8}}\,M$
d. Human saliva, $6.4$
Hence hydrogen ion concentration is $= {10^{ - 6.4}} = 3.981 \times {10^{ - 7}}\,M$.

Note:
Normally whenever the temperature is ${25^o}C$,if any solution has a $pH$ value less than $7$, then the solution is known as acidic and if any solution has a $pH$ value more than $7$ then the solution is known as basic .The solution is said to neutral in nature when its $pH$ value is equal to $7$. These $pH$ values lie in between $7$ and $14$.