Initial moles of CH₃COOH = 1.00 x 0.0100 = 0.0100 mol
Initial moles of CH₃COONa = 1.00 x 0.100 = 0.100 mol
Let a be the volume of HNO₃ that must be added
Moles of HNO₃ added = a/1000 x 10.0 = 0.01a mol
CH₃COONa + HNO₃ => CH₃COOH + NaNO₃
Moles of CH₃COOH = 0.0100 + 0.01a
Moles of CH₃COONa = 0.100 - 0.01a
pH = pKa + log([CH₃COONa]/[CH₃COOH])
= pKa + log(moles of CH₃COONa/moles of CH₃COOH)
5.05 = 4.75 + log((0.100 - 0.01a)/(0.0100 + 0.01a))
log((0.100 - 0.01a)/(0.0100 + 0.01a)) = 0.3
(0.100 - 0.01a)/(0.0100 + 0.01a) = 10^0.3 = 2.0
0.03 a = 0.08
a = 2.67
<span>Volume of HNO3 = a = </span>2.13 mL
Specific heat of the metal = 1003.2J/kgC
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=
![\dfrac{[H^{+}] [A^{-}]}{[HA]}](https://tex.z-dn.net/?f=%5Cdfrac%7B%5BH%5E%7B%2B%7D%5D%20%5BA%5E%7B-%7D%5D%7D%7B%5BHA%5D%7D)
</h2>
Explanation:
- When an aqueous solution of a certain acid is prepared it is dissociated is as follows-
⇄ 
Here HA is a protonic acid such as acetic acid, 
- The double arrow signifies that it is an equilibrium process, which means the dissociation and recombination of the acid occur simultaneously.
- The acid dissociation constant can be given by -
= ![\dfrac{[H^{+}] [A^{-}]}{[HA]}](https://tex.z-dn.net/?f=%5Cdfrac%7B%5BH%5E%7B%2B%7D%5D%20%5BA%5E%7B-%7D%5D%7D%7B%5BHA%5D%7D)
- The reaction is can also be represented by Bronsted and lowry -
⇄ ![[H_3O^+] [A^-]](https://tex.z-dn.net/?f=%5BH_3O%5E%2B%5D%20%5BA%5E-%5D)
- Then the dissociation constant will be
= ![\dfrac{[H_3O^{+}] [A^{-}]}{[HA]}](https://tex.z-dn.net/?f=%5Cdfrac%7B%5BH_3O%5E%7B%2B%7D%5D%20%5BA%5E%7B-%7D%5D%7D%7B%5BHA%5D%7D)
Here,
is the dissociation constant of an acid.
A barometer measures atmospheric pressure.
Since the given formula is . According to cross method formula, magnesium has +2 charge so, is multiplied by 2.
Thus, 1 molecule of magnesium phosphate will contain 2 atoms of phosphorus.
Therefore, three molecules of magnesium phosphate contains following number of atoms.
Mg = 9
P = 6
O = 24
Hence, we can conclude that there are 6 atoms of phosphorus in three molecules of magnesium phosphate, .