17.90 **Transcription and Explanation for Educational Website:**---**17.85:**Furoic acid \((\text{HC}_5\text{H}_3\text{O}_3)\) has a \( K_a \) value of \( 6.76 \times 10^{-4} \) at 25°C. Calculate the pH at 25°C of the solutions prepared by:(a) Adding 25.0 g of furoic acid to \[0.500 \, \text{L} \] of 0.234 \[ \text{M} \, \text{NaC}_5 \text{H}_3 \text{O}_3 \) to form a buffer.(b) A solution formed by mixing 10.0 mL of 0.234 \[ \text{M} \, \text{HC}_5 \text{H}_3 \text{O}_3\] and 20.0 mL of 0.22 \[\text{M}\] \[ \text{NaC}_5 \text{H}_3 \text{O}_3\], diluted to a total volume of 125 mL.(c) A solution prepared by mixing 50.0 mL of 1.65 \[\text{M} \, \text{NaOH}\] solution to 0.500 L of 0.0850 \[\text{M} \, \text{HC}_5\text{H}_3\text{O}_3\].**17.86:**The acid-base indicator bromocresol green is a weak acid. The yellow acid and blue base forms of the indicator are present in equal concentrations for a solution where the pH is 4.68. What is the \( \text{pK}_a \) for bromocresol green?**17.87:**Equal quantities of 0.010 \[\text{M}\] solutions of acid HA and base B are mixed. The pH of the resulting solution is 9.15.(a) Write the chemical equation and the equilibrium expression for the reaction between HA and B.(b) If \([HA]\) is \( 8.0 \times 10^{-5}\), what is the value of the equilibrium constant for the reaction between HA and B?(c) What is the value

Given The mass of unknown monoprotic acid is 0.2140 g. The volume of water is 25.0 mL. The…

17.90 A sample of 0.2140 g of an unknown monoprotic acid was dissolved in 25.0 mL of water and titrated with 0.0950 M NaOH. The acid required 30.0 mL of base to reach the equivalence point. (a) What is the molar mass of the acid? (b) After 15.0 mL of base had been added in the titration, the pH was found to be 6.50. What is the K, for the un- known acid?

17.90 A sample of 0.2140 g of an unknown monoprotic acid was dissolved in 25.0 mL of water and titrated with 0.0950 M NaOH. The acid required 30.0 mL of base to reach the equivalence point. (a) What is the molar mass of the acid? (b) After 15.0 mL of base had been added in the titration, the pH was found to be 6.50. What is the K, for the un- known acid?

Chemistry

10th Edition

ISBN:9781305957404

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

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

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

17.90

**Transcription and Explanation for Educational Website:**

---

**17.85:**
Furoic acid \((\text{HC}_5\text{H}_3\text{O}_3)\) has a \( K_a \) value of \( 6.76 \times 10^{-4} \) at 25°C. Calculate the pH at 25°C of the solutions prepared by:
(a) Adding 25.0 g of furoic acid to \[0.500 \, \text{L} \] of 0.234 \[ \text{M} \, \text{NaC}_5 \text{H}_3 \text{O}_3 \) to form a buffer.
(b) A solution formed by mixing 10.0 mL of 0.234 \[ \text{M} \, \text{HC}_5 \text{H}_3 \text{O}_3\] and 20.0 mL of 0.22 \[\text{M}\] \[ \text{NaC}_5 \text{H}_3 \text{O}_3\], diluted to a total volume of 125 mL.
(c) A solution prepared by mixing 50.0 mL of 1.65 \[\text{M} \, \text{NaOH}\] solution to 0.500 L of 0.0850 \[\text{M} \, \text{HC}_5\text{H}_3\text{O}_3\].

**17.86:**
The acid-base indicator bromocresol green is a weak acid. The yellow acid and blue base forms of the indicator are present in equal concentrations for a solution where the pH is 4.68. What is the \( \text{pK}_a \) for bromocresol green?

**17.87:**
Equal quantities of 0.010 \[\text{M}\] solutions of acid HA and base B are mixed. The pH of the resulting solution is 9.15.
(a) Write the chemical equation and the equilibrium expression for the reaction between HA and B.
(b) If \([HA]\) is \( 8.0 \times 10^{-5}\), what is the value of the equilibrium constant for the reaction between HA and B?
(c) What is the value

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