When a solution is diluted, does its concentration increase, decrease, or remain

Question

When a solution is diluted, does its concentration increase, decrease, or remain the same? If you had a 100 mL of 2.00 M HCI and you added 100 mL to it what is the final volume and final concentration? The standard solutions used in this lab were made using a Fe^2+ stock solution containing 0.1756 g of (NH_4)_2 Fe(SO_4)_2 middot 6H_2 O in 250.0 mL. The molar mass of (NH_4)_2 Fe(SO_4)_2 middot 6H_2 O is 392.15 g/mol. a. Calculate the molarity of (NH_4)_2 Fe(SO_4)_2 middot 6H_2 O in this stock solution. b. Calculate the molarity of Fe^2+ in this stock solution. c. Calculate the concentration of (NH_4)_2 Fe(SO_4)_2 middot 6H_2 O in the stock solution in units of g/L. d. Calculate the concentration of Fe^2+ in the stock solution in units of g/L. e. Calculate the concentration of (NH_4)_2 Fe(SO_4)_2 middot 6H_2 O in the stock solution in units of mu g/dL. f. Calculate the concentration of Fe^2+ in the stock solution in units of mu g/dL.

Explanation / Answer

1. On dilution moles of solute don't change but volume of solution increase hence concentration i.e moles per unit volume decrease.

2. Millimoles of HCl don't change

M1V1=M2V2

100×2=M2×200

M2=1 M

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