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# molar concentration

From Wikipedia

Molar concentration

Molar concentration, also called molarity, amount concentration or substance concentration, is a measure of the concentration of a solute in a solution, or of any chemical species in terms of amount of substance in a given volume. A commonly used unit for molar concentration used in

Question:In a titration experiment 148.65 mL of 0.778 M KOH is reacted with H2SO4. The endpoint is reached when 77.53 mL of the acid is mixed with the base. What is the molar concentration of the acid?

Answers:moles KOH = 0.14865 L x 0.778 M=0.116 moles H2SO4 = 0.116/2=0.0580 [H2SO4]= 0.0580 / 0.07753 L = 0.748 M

Question:The wall of an Erlenmeyer flask is occasionally rinsed with water from the wash bottle during the analysis of the acid solution. How does this affect the reported molar concentration of the acid solution? Explain.

Answers:We must be in the same lab because I was just about to ask the same thing. I think it doesn't affect the molar concentration because the NaOH is hygroscopic.

Question:If 25.0 mL of a solution of acetic acid requires 31.2 mL of a 0.0724 M solution of sodium hydroxide to reach the endpoint, what was the molar concentration of acetic acid in the solution?

Answers:moles NaOH = 0.0312 L x 0.0724 M=0.00226 CH3COOH + NaOH = CH3COONa + H2O the ratio between CH3COOH and NaOH is 1 : 1 moles acetic acid = 0.00226 Molarity acetic acid = 0.00226 mol/ 0.0250 L=0.0904 M

Question:What is the molar concentration of a solution of sulfuric acid, H2SO4, if 3.52 mL react completely with 0.973 g of NaOH which was dissolved in 200 mL of water?

Answers:moles NaOH = 0.973 g/ 40 g/mol=0.0243 moles H2SO4 = 0.0243 /2=0.0122 M = 0.0122 / 3.52 x 10^-3 L=3.46