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Anonymous

Dec 04, 2024

A0.1025-g sample of copper metal is dissolved in 35 ml of concentrated hno3 to form cu2 ions and then water is added to make a total

A 0.1025-g sample of copper metal is dissolved in 35 mL of concentrated HNO3, resulting in the formation of Cu²⁺ ions. Afterward, water is added to achieve a total volume of 200.0 mL. What is the molarity of the Cu²⁺ ions in this solution?

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Anonymous

Dec 22, 2024

Molarity is defined as number of moles of solute in 1 L of solution.Here, 0.1025 g of Cu is reacted with 35 mL of HNO_{3} to produced Cu^{2+} ions. The balanced reaction will be as follows:Cu+3HNO_{3}rightarrow Cu(NO_{3})_{2}+NO_{2}+H_{2}O From the above reaction, 1 mole of Cu produces 1 mole of Cu^{2+}, convert the mass of Cu into number of moles as follows:n=frac{m}{M}molar mass of Cu is 63.55 g/mol thus,n=frac{0.1025 g}{63.55 g/mol}=0.0016 molNow, total molarity of solution, after addition of water is 200 mL or 0.2 L can be calculated as follows: M=frac{n}{V}=frac{0.0016 mol}{0.2 L}=0.008 mol/L=0.008 MThus, molarity of Cu^{2+} is 0.008 M.
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Loyal Homenick IV

Jan 23, 2025

cytokinesis is the splitting of a cell membrane to form 2 identical daughter cells. it's similar to mitosis as both cells have identical copies of dna and cytokinesis is a step in the mitotic cycle.
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