Which of the following statements is correct? A 0.20 M solution of Cu^2+ absorbs

Question

Which of the following statements is correct? A 0.20 M solution of Cu^2+ absorbs half as much light (at 620 nm) as a 0.10 M solution of Cu^2+. A 0.20 M solution of Cu^2+ absorbs the same amount of light (at 620 nm) as a 0.10 M solution of Cu^2+. A 0.20 M solution of Cu^2+ absorbs twice as much light (at 620 nm) as a 0.10 M solution of Cu^2+. A 0.20 M solution of Cu^2+ absorbs four times as much light (at 620 nm) as a 0.10 M solution of Cu^2+. Cu^2+ solutions do not absorb light. Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-). spaces (e.g.. as thousands separator. 5 000). "E" or "e" (used in scientific notation). Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. For example: {1 + 1i} is valid whereas {1 + i) is not. (0 + 9i) is valid whereas (9i) is not. What is the concentration of Cu^2+ in a solution prepared by mixing 10.00 mL of 0.813 M copper(ll) sulfate with 20.00 mL of water? M

Explanation / Answer

According to Beer's law, absorbance is directly proportional to concentration of solution.

(C)

***

Dilution formula,

M1V1 = M2V2

0.813 * 10.00 = M2 * 30.00

M2 = 0.271 M   final concnetration after mixing 20.00 mL of water.

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