Question

An alcoholic drink substance $pH = 4.7$ then $O{H^ - }$ ion concentration of this solution is
$[{K_w} = {10^{ - 14}}mo{l^2}/{l^2}]$

Answer 1

The $pH$ scale is discernible to a bunch of standard arrangements whose pH is set up by worldwide agreement. Primary $pH$ standard qualities are resolved utilizing a focus cell with transaction, by estimating the possible distinction between a hydrogen cathode and a standard terminal, for example, the silver chloride anode. The $pH$ of fluid arrangements can be estimated with a glass cathode and a $pH$ meter, or a shading evolving pointer.

Complete step by step answer:
Let us first write down what is given to us from the question:
We were given;
pH of alcoholic drink is 4.7
and the, $pOH$ of drink is given by:
$pOH$ of drink = $14 - pH$
As we know the value of pH let us substitute the value in the above. Then we will get:
$pOH = 14 - 4.7$
$\Rightarrow pOH = 9.3$
$\Rightarrow - \log [O{H^ - }] = pOH$
Hence, $[O{H^ - }] = {10^{ - pOH}}$
As we know the value of $pOH$ ,the above equation will become:
$[O{H^ - }] = {10^{ - 9.3}}$
And the solved value will become $5 \times {10^{ - 10}}$.
Hence, the concentration after all the calculation we get as $[O{H^ - }] = 5 \times {10^{ - 10}}$
Thus, the correct option is B.

ADDITIONAL INFORMATION:
Hydrogen particle fixation is one of the significant components that influence development and increase of green growth and thus the oil and biodiesel creation. Most algal development happens in the area of unbiased $pH$, albeit ideal $pH$ is the $pH$ of starting society where an alga is adjusted to develop.
The critical impact of the hydrogen particle focus on the properties of water-based penetrating liquids has for quite some time been perceived and has been the subject of various examinations. In this manner, in an unbiased arrangement the hydrogen particle and the hydroxyl particle focus are equivalent, and each is equivalent to 10−7.

Note:
A hydrogen-particle focus influences the movement of catalysts and in this manner the microbial development rate. The ideal $pH$ for development might be unique in relation to that for item arrangement. By and large, the satisfactory $pH$ range differs about the ideal by 1 to 2 $pH$ units. Various living beings have diverse $pH$ optima: the $pH$ ideal for some, microbes goes from $pH$ 3–8; for yeast, $pH$ 3–6; for molds, $pH$3–7; for plant cells, $pH$ 5–6; and for creature cells, $pH$ 6.5–7.5.