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Part of a buret measuring in mL is shown below. Read the volume to the proper number of significant digits.

Part of a buret measuring in mL is shown below. Read the volume to the proper number of significant digits.

Chemistry
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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## Titration Exercise ### Understanding the Buret 1. **Part of a buret measuring in mL is shown below. Read the volume to the proper number of significant digits.** **Diagram:** - The image displays a portion of a buret scale marked in milliliters (mL). - Markings are numbered from 45 to 49 mL with 0.1 mL gradations. - Accurate reading requires noting the meniscus level, typically read at eye level to ensure precision. **Volume: ____________ mL** ### Titration Problem 2. **Suppose it takes 33.69 mL of 0.005123 M EDTA to titrate 25.00 mL of a hard water solution.** a) **How many moles of EDTA were required to titrate to the endpoint?** b) **How many moles of hard water ions, expressed as moles of Ca\(^{2+}\), are present in the hard water solution?** c) **What is the concentration, expressed as molarity of Ca\(^{2+}\), of hard water ions in the solution?** d) **If the metal ions in the hard water all came from CaCO\(_3\), how many grams of CaCO\(_3\) would be in 1.000 L of the solution (in other words, determine g CaCO\(_3\)/L)?** e) **Convert g CaCO\(_3\)/L calculated in (d) to mg CaCO\(_3\)/L. (This is equivalent to ppm.)** ### Detailed Instructions: - **Step 1:** Calculate the moles of EDTA using the volume and molarity provided. - **Step 2:** Use the stoichiometry of the reaction to find moles of Ca\(^{2+}\) equivalent to moles of EDTA. - **Step 3:** Determine the molarity of Ca\(^{2+}\) using the volume of the hard water solution. - **Step 4:** Calculate the mass of CaCO\(_3\) if all calcium ions originated from CaCO\(_3\). - **Step 5:** Convert mass per liter to mg/L to express it as parts per million (ppm). Ensure accuracy in calculation and maintain proper significant digits throughout the solutions.
Transcribed Image Text:## Titration Exercise ### Understanding the Buret 1. **Part of a buret measuring in mL is shown below. Read the volume to the proper number of significant digits.** **Diagram:** - The image displays a portion of a buret scale marked in milliliters (mL). - Markings are numbered from 45 to 49 mL with 0.1 mL gradations. - Accurate reading requires noting the meniscus level, typically read at eye level to ensure precision. **Volume: ____________ mL** ### Titration Problem 2. **Suppose it takes 33.69 mL of 0.005123 M EDTA to titrate 25.00 mL of a hard water solution.** a) **How many moles of EDTA were required to titrate to the endpoint?** b) **How many moles of hard water ions, expressed as moles of Ca\(^{2+}\), are present in the hard water solution?** c) **What is the concentration, expressed as molarity of Ca\(^{2+}\), of hard water ions in the solution?** d) **If the metal ions in the hard water all came from CaCO\(_3\), how many grams of CaCO\(_3\) would be in 1.000 L of the solution (in other words, determine g CaCO\(_3\)/L)?** e) **Convert g CaCO\(_3\)/L calculated in (d) to mg CaCO\(_3\)/L. (This is equivalent to ppm.)** ### Detailed Instructions: - **Step 1:** Calculate the moles of EDTA using the volume and molarity provided. - **Step 2:** Use the stoichiometry of the reaction to find moles of Ca\(^{2+}\) equivalent to moles of EDTA. - **Step 3:** Determine the molarity of Ca\(^{2+}\) using the volume of the hard water solution. - **Step 4:** Calculate the mass of CaCO\(_3\) if all calcium ions originated from CaCO\(_3\). - **Step 5:** Convert mass per liter to mg/L to express it as parts per million (ppm). Ensure accuracy in calculation and maintain proper significant digits throughout the solutions.
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