Chemistry- Volumetric analysis. Urgent help needed?
Friday, January 29th, 2010 at
8:00 AM
Each 200 mL of an electrolyte solution designed for treating
dehydration contains 0.47 g of sodium chloride (NaCl), 0.30 g
of potassium chloride (KCl) and 3.56 g of glucose (C6H12O6).
a. Calculate the concentration of each compound, in g L?1.
b. Calculate the molarity of each compound.
I though molarity and concentration were the same thing!! I am mega confused…
Filed under: Potassium and Being Sick
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molarity is a measure of concentration: moles per liter
grams per liter is another measure of concentration
a) 0.47g/0.200 L = 2.35 g/L NaCl
0.30g/0.200 L = 1.50 g/L KCl
3.56g/0.200 L = 17.80g/L Glucose
b) 2.35 g NaCl = 0.0171 moles NaCl; 0.0171 Molar
1.50 g KCl = 0.0201 moles KCl; 0.0201 Molar
17.80g Glucose = 0.0988 moles C6H12O6; 0.0988 Molar
a) is in gram / litre, this is still concentration molarity can only be mols / litre
0.47g / 0.200 L = 2.35 g / L , NaCl and so on
b) 2.35g / (22.9 + 35.45) g/mol / 0.200 L = 0.201 mol / L, NaCl and so on