**Buffer Preparation with Potassium Cyanide**To prepare a buffer solution with a pH of 8.604, calculate the necessary grams of solid potassium cyanide to be added to 1.00 L of a 0.193 M hydrocyanic acid solution.**Query:**- How many grams of solid **potassium cyanide** should be added?- **Hydrocyanic acid solution:** 0.193 M- **Final buffer pH required:** 8.604**Calculation:**Grams of potassium cyanide needed: [Enter value in the box]\[\text{grams potassium cyanide} = \_\_\_\_ \text{g}\]Utilize this information for educational purposes in constructing buffer solutions and understanding the role of pH in chemical reactions.

As we know that Pka value for HCN = 9.2 Molar mass of KCN = 65 g/mol Now, Using Henderson-Hesselberg equation - pH = pKa + log(conjugate)/acid 8.604 = 9.2 + log (conjugate)/(0.193) -0.596 = log (conjugate)/0.193 (Conjugate)/0.193 = 10^-0.596 = 0.2535 Hence , (Conjugate) =0.2535*0.193 Moles / volume = 0.049 Since volume is 1 l. Moles = 0.049 Moles = weight in grams / molar mass Weight = 0.049*65 = 3.185 grams Read solution given above. CN- will be conjugate.

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How many grams of solid potassium cyanide should be added to 1.00 L of a 0.193 M hydrocyanic acid solution to prepare buffer with a pH of 8.604 ? grams potassium cyanide = g.

Chemistry

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ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

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Concept explainers

Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.

Question

**Buffer Preparation with Potassium Cyanide**

To prepare a buffer solution with a pH of 8.604, calculate the necessary grams of solid potassium cyanide to be added to 1.00 L of a 0.193 M hydrocyanic acid solution.

**Query:**
- How many grams of solid **potassium cyanide** should be added?
- **Hydrocyanic acid solution:** 0.193 M
- **Final buffer pH required:** 8.604

**Calculation:**

Grams of potassium cyanide needed: [Enter value in the box]

\[
\text{grams potassium cyanide} = \_\_\_\_ \text{g}
\]

Utilize this information for educational purposes in constructing buffer solutions and understanding the role of pH in chemical reactions.

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