a buffer solution contains 0.376 m ammonium chloride and 0.366 m ammonia. if 0.0486 moles of potassium hydroxide are added to 225 ml of this buffer, what is the ph of the resulting solution ?

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16-11-2022
Chemistry

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a buffer solution contains 0.376 m ammonium chloride and 0.366 m ammonia. if 0.0486 moles of potassium hydroxide are added to 225 ml of this buffer, what is the ph of the resulting solution ?

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kumarprabhat kumarprabhat · Answer 1 · 2022-11-27T04:01:32+01:00

A buffer solution contains 0.376 m ammonium chloride and 0.366 m ammonia. if 0.0486 moles of potassium hydroxide are added to 225 ml of this buffer, The ph of the resulting solution is 9.18

Milli moles of NH3 = 0.366 x 225 = 82.35

milli moles of NH4CL = 0.376 x 225 = 84.6

milli moles of KOH = 0.0486

pOH = pKb + log[salt -c /base +c]

= 4.74 + log[84.6 - 0.0486 / 82.35 +0.0486]

= 4.8194

pH = 9.18

A weak acid and its conjugate base, or vice versa, are combined to form an aqueous solution known as a buffer solution (more specifically, pH buffer or hydrogen ion buffer). A little bit of a strong acid or base applied to it barely affects its pH. In a wide range of chemical applications, buffer solutions are employed to maintain pH at a value that is nearly constant. Numerous life systems in nature use buffering to regulate pH. For instance, bicarbonate serves as a buffer in the ocean and is utilized to control the pH of blood through the bicarbonate buffering system.

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