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The density of 3M solution of NaCl is 1.25g/ml.Calculate molarity.?
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The density of 3M solution of NaCl is 1.25g/ml.Calculate molarity.?
Formula to Calculate Molarity (M)

Molarity is the concentration of a solution, which is defined as the number of moles of solute per liter of solution. The formula to calculate molarity is:


M = moles of solute / volume of solution in liters


Calculate Moles of NaCl

To calculate the moles of NaCl, we need to know its molecular weight. The molecular weight of NaCl is 58.44 g/mol. Therefore, the moles of NaCl can be calculated as:


moles of NaCl = mass of NaCl / molecular weight of NaCl

moles of NaCl = 3M x 1.25 g/ml / 58.44 g/mol

moles of NaCl = 0.064 mol


Calculate Volume of Solution in Liters

The volume of the solution can be calculated using the following formula:


volume of solution = mass of solution / density of solution

mass of solution = 3M x 1000 ml = 3000 g

volume of solution = 3000 g / 1.25 g/ml = 2400 ml = 2.4 L


Calculate Molarity

Now that we have calculated the moles of NaCl and the volume of the solution, we can calculate the molarity using the formula:


M = moles of solute / volume of solution in liters

M = 0.064 mol / 2.4 L = 0.027 M


Final Answer

The molarity of the 3M solution of NaCl is 0.027 M.
Community Answer
The density of 3M solution of NaCl is 1.25g/ml.Calculate molarity.?
Molarity =3M
Molar mass is NaCl =58.5
Density =3×58.5=175.5
IL=1000
1.25 ×1,000 =1250
Mass of solution =1250-175.5=1074.5g
1g=1000kg
1074.5÷1000=1.0745kg
Molarity = No. of moles of solute÷mass of solvents in kg
3mol÷1074.5kg =2.79m
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