Name of the compound MgS
1 answer:
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Answer:
Please find the complete question in the attached file.
Explanation:
A 29.4 ml sample of 0.347 m triethylamine, (c2h5)3n, is titrated with 0.375 m hydrobromic acid. at the equivalence point, the pH is 5.81.
Given,
Volume of Triethylamine (C₂H₅)₃N = 29.4 ml = 0.0294 L
Molarity of (C₂H₅)₃N = 0.275 M
Molarity of HBr = 0.375M
Solution:
(C₂H₅)₃N + HBr ⇔ (C₂H₅)₃ NH⁺ + Br⁻
⇒ Volume of HBr = mole of (C₂H₅)₃N / Molarity of HBr
⇒ Volume of HBr = 0.00572 mol / 0.375 mol/l
⇒ Volume of HBr = 0.0152 L
∴ Total Volume = 0.0294 + 0.0152
⇒ Total Volume = 0.0446 L
Concentration of (C₂H₅)₃NH⁺ = ⇒ 0.128 M,
(C₂H₅)₃NH⁺ + H₃O⁺ ⇄ (C₂H₅)₃N + H₃O⁺
let's assume, (C₂H₅)₃N = ,
⇒ H₃O⁺ = , and
⇒ (C₂H₅)₃NH⁺ = 0.128 -
∴ Now, k = kw / kb
⇒ k = 1.9 × 10⁻¹¹
and, k = [(C₂H₅)₃N][H₃O⁺] / (C₂H₅)₃NH⁺
⇒ 1.9 × 10⁻¹¹ = / (0.128 -
)
Thus, = 1.55 × 10⁻⁶ M,
Hence, pH = - log[x]
⇒ - log [1.55 × 10⁻⁶ ]
⇒ - log (1.55) - log (10⁻⁶)
⇒ - log (1.55) + 6log10
⇒ - 0.19 + 6
⇒ 5.81 = pH
Therefore, pH = 5.81.
To learn more about equivalence point here
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Answer: The molarity of the juice decreases.
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per kg of the solvent.
where,
n = moles of solute
= volume of solution in L
As volume of solution is inversely proportional to molarity, as water is added to juice, the volume of solution increases and thus the molarity decreases.
The moles remain fixed on adding water to juice.