Read the passage below about acupuncture.
2 answers:
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<u>Answer:</u> The unknown salt is NaF
<u>Explanation:</u>
To calculate the molarity of solution, we use the equation:
Moles of salt = 0.050 moles
Volume of solution = 0.500 L
Putting values in above equation, we get:
- To calculate the hydroxide ion concentration, we first calculate pOH of the solution, which is:
pH + pOH = 14
We are given:
pH = 8.08
- To calculate pOH of the solution, we use the equation:
Putting values in above equation, we get:
The unknown salt given are formed by the combination of weak acid and strong acid which is NaOH
The chemical equation for the hydrolysis of ions follows:
<u>Initial:</u> 0.1
<u>At eqllm:</u> 0.1-x x x
Concentration of
The expression of for above equation follows:
Putting values in above expression, we get:
- To calculate the acid dissociation constant for the given base dissociation constant, we use the equation:
where,
= Ionic product of water =
= Acid dissociation constant
= Base dissociation constant =
Putting values in above equation, we get:
We know that:
So, the calculated is approximately equal to the
of HF
Hence, the unknown salt is NaF