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Chemistry
Posted 3 months ago

Please also explain how you calculate the initial moles, because I do not get the correct number.Calculate the pH\mathrm{pH} of the resulting solution at 25 degrees C\mathrm{C}, when 50,1ml50,1 \mathrm{ml} of 0,100 mol/lsodium0,100 \mathrm{~mol} / \mathrm{lsodium} hydroxide solution NaOH\mathrm{NaOH} has been added to 50,0ml50,0 \mathrm{ml} of;
a) 0,100 mol/l0,100 \mathrm{~mol} / \mathrm{l} hydrochloric acid HCl\mathrm{HCl} solution.
b) 0,100 mol/l0,100 \mathrm{~mol} / \mathrm{l} ethanoic acid CH3COOH\mathrm{CH} 3 \mathrm{COOH} solution. pKa of ethanoic acid =4,76=4,76.
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Answer from Sia
Posted 3 months ago
A
Key Concept
Neutralization Reaction
Explanation
When NaOH is added to HCl, a strong acid and a strong base neutralize each other to form water and salt (NaCl). The resulting solution is neutral with a pH of 7.
B
Key Concept
Buffer Solution and Henderson-Hasselbalch Equation
Explanation
When NaOH is added to ethanoic acid, a weak acid, it partially neutralizes the acid, forming its conjugate base (acetate ion). The pH of the resulting buffer solution can be calculated using the Henderson-Hasselbalch equation: pH=pKa+log([A][HA]) \text{pH} = \text{pKa} + \log \left( \frac{[\text{A}^-]}{[\text{HA}]} \right) .

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