When some alkali is added to a solution of
an acid, will the pH to value of the
solution increase or decrease ?
Answers
Answer:
The acid is becoming less acidic. Similarly, when an alkali is diluted with water the concentration of OH - ions decreases. This causes the pH of the alkali to fall towards 7, making the solution less alkaline as more water is added.
Answer:
p H increases; sometimes it rises substantially.
Explanation:
p H , potenz hydrogen is a measure of hydrogen ion concentration, i.e.
[ H 3 O+ ] .
By definition, pH=− log 10 [H3O+], so that acidic solution have low (or even negative) values of p H , and alkaline solutions have high values of pH.
In water, the following equilibrium occurs:
H2O(l)⇌H3O(+)+HO−
At 298⋅K we can measure the value of this equilibrium very accurately:
[H3O+][−OH ] = 10−14
And taking log10 of both sides:
log10 [H3O +]+log10 [H O−] = log10 (10 -14) = −14
On rearrangement,
14 = −log10 [H3O+]−log10[HO−]
To give (finally):
14 = pH+pOH