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Principles of General Chemistry | 2nd Edition | ISBN: 9780073511085 | Authors: Martin S. Silberberg
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To study a marine organism, a biologist prepares a 1.00-kg

Chapter 4, Problem 18P

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QUESTION: Problem 18P

To study a marine organism, a biologist prepares a 1.00-kg sample to simulate the ion concentrations in seawater. She mixes 26.5 g of NaCl, 2.40 g of MgCI2. 3.35 g of MgSO4, 1.20 g of CaCl2,1.05 g of KC1,0.315 g of NaHCO3, and 0.098 g of NaBr in distilled water, (a) If the density of the solution is 1.025 g/cm3, what is the molarity of each ion? (b) What is the total molarity of alkali metal ions? (c) What is the total molarity of alkaline earth metal ions? (d) What is the total molarity of anions?

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QUESTION: Problem 18P

To study a marine organism, a biologist prepares a 1.00-kg sample to simulate the ion concentrations in seawater. She mixes 26.5 g of NaCl, 2.40 g of MgCI2. 3.35 g of MgSO4, 1.20 g of CaCl2,1.05 g of KC1,0.315 g of NaHCO3, and 0.098 g of NaBr in distilled water, (a) If the density of the solution is 1.025 g/cm3, what is the molarity of each ion? (b) What is the total molarity of alkali metal ions? (c) What is the total molarity of alkaline earth metal ions? (d) What is the total molarity of anions?

ANSWER:

Step 1 of 5

Part A

Density= 1.025 Kg/L

Number of moles of sodium chloride =

Here, sodium cation and chloride anion will have the same molarity as that of sodium chloride, which is 0.464 M.

 

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