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 25 of 30**
To find the percent of vitamin C by mass in a tablet, a titration is performed using Potassium hydrogen phthalate (KHP, molar mass = 204.22 g/mol) as the primary standard. KHP has one acidic hydrogen. In the experiment, 31.55 mL of NaOH solution is required to titrate (react exactly with) 0.750 g of KHP.
This standard solution is then used to determine the amount of ascorbic acid in a 500.0 mg tablet of vitamin C. Ascorbic acid (C₆H₈O₆, molar mass = 176.12 g/mol) also has one acidic hydrogen and is usually mixed with filler in tablets. The titration of ascorbic acid requires 19.74 mL of the NaOH solution for a 500.0 mg tablet.
**Task:** Calculate the percent vitamin C by mass in the tablet.
**Input Field:** [ % ]
**Numeric Keypad Instructions:**
- Use the keypad to enter the answer.
- To enter a decimal, use the "." key.
- For negative numbers, use the "+/-" key.
- Press "C" to clear the input.
- Use "x 10 □" for scientific notation if needed.
**Additional Resources:** Tap here or pull up as needed for further guidance.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F6a85ba4d-6f5c-41bf-97e5-182adb23b838%2Fce5ba6d5-db6c-4b9d-895b-e1e3fa72fcb2%2Fgb97jnb_processed.png&w=3840&q=75)
Transcribed Image Text:**Question 25 of 30**
To find the percent of vitamin C by mass in a tablet, a titration is performed using Potassium hydrogen phthalate (KHP, molar mass = 204.22 g/mol) as the primary standard. KHP has one acidic hydrogen. In the experiment, 31.55 mL of NaOH solution is required to titrate (react exactly with) 0.750 g of KHP.
This standard solution is then used to determine the amount of ascorbic acid in a 500.0 mg tablet of vitamin C. Ascorbic acid (C₆H₈O₆, molar mass = 176.12 g/mol) also has one acidic hydrogen and is usually mixed with filler in tablets. The titration of ascorbic acid requires 19.74 mL of the NaOH solution for a 500.0 mg tablet.
**Task:** Calculate the percent vitamin C by mass in the tablet.
**Input Field:** [ % ]
**Numeric Keypad Instructions:**
- Use the keypad to enter the answer.
- To enter a decimal, use the "." key.
- For negative numbers, use the "+/-" key.
- Press "C" to clear the input.
- Use "x 10 □" for scientific notation if needed.
**Additional Resources:** Tap here or pull up as needed for further guidance.
Transcribed Image Text:**Titration of NaOH Solution Using KHP**
In this laboratory procedure, you prepare a standard sodium hydroxide (NaOH) solution using potassium hydrogen phthalate (KHC₈H₄O₄), abbreviated as KHP, as the primary standard. KHP has a molar mass of 204.22 g/mol and contains one acidic hydrogen atom.
**Titration Process:**
- **Preparation with KHP:**
- To titrate 0.750 g of KHP, it required 31.55 mL of the NaOH solution to achieve a complete reaction.
- **Analysis of Ascorbic Acid:**
- This standardized NaOH solution is then utilized to determine the quantity of ascorbic acid in a 500.0 mg tablet of vitamin C.
- Ascorbic acid (HC₆H₈O₆) has a molar mass of 176.12 g/mol and similarly has one acidic hydrogen atom. It is often mixed with fillers in tablet preparation.
- For this reaction, 19.74 mL of NaOH is necessary to exactly react with the ascorbic acid in the tablet.
This procedure exemplifies how titration can be used to standardize a solution and then use that solution to quantify the concentration of an acidic substance in a given sample.
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