Calculations- molar concentrations PLS HELP

In summary, the molar concentration of 0.50 mol of NaCl dissolved in 0.30L of solution is 1.7 mol/L. To find the mass of solute present in 1.00L of 0.045 mol/L of Ca(OH)2 solution, you need to first find the number of moles of Ca(OH)2 present using the formula nCa(OH)2 = CCa(OH)2 x Vsolution. Then, you can calculate the mass of the solute using the formula mCa(OH)2 = nCa(OH)2 x M(Ca(OH)2), where M stands for molar mass.
  • #1
Aya
46
0
Hi, I need help with this question

what is the molar concentration of 0.50 mol of NaCl dissolved in 0.30L of solution?

=moles of solute/leters of solution
=0.50mol/0.30L
=1.7 mol/L

Is this correct?

and

what mass of solute is present in 1.00L of 0.045 mol/L of Ca(oH)2, solution

I have no idea how to do this one
 
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  • #2
Aya said:
what is the molar concentration of 0.50 mol of NaCl dissolved in 0.30L of solution?

=moles of solute/leters of solution
=0.50mol/0.30L
=1.7 mol/L

Is this correct?

Yes, it is. :tongue:

what mass of solute is present in 1.00L of 0.045 mol/L of Ca(oH)2, solution

I have no idea how to do this one

First find how many moles of Ca(OH)2 there is.
nCa(OH)2 = CCa(OH)2 x Vsolution

Then find the mass of that number os moles:

mCa(OH)2 = nCa(OH)2 x M(Ca(OH)2)

M stands for http://en.wikipedia.org/wiki/Molar_mass" .
 
Last edited by a moderator:
  • #3
^ ok, thank you
 
Last edited:

1. How do you calculate molar concentration?

Molar concentration is calculated by dividing the moles of solute by the volume of the solution in liters. The formula for molar concentration is M = n/V, where M is the molar concentration, n is the number of moles, and V is the volume in liters.

2. What is the unit of molar concentration?

Molar concentration is typically expressed in units of moles per liter (mol/L) or sometimes in millimoles per liter (mmol/L).

3. How do you convert between molarity and molality?

Molarity and molality are two different ways of expressing concentration. Molarity is moles of solute per liter of solution, while molality is moles of solute per kilogram of solvent. To convert between the two, you need to know the density of the solution. The formula for converting molarity M to molality m is m = M / (1 + ρM), where ρ is the density of the solution in g/mL.

4. What is the difference between molarity and normality?

Molarity and normality are two different ways of expressing concentration. Molarity is based on the number of moles of solute per liter of solution, while normality is based on the number of equivalent weights of solute per liter of solution. For example, a 1 M solution of HCl contains 1 mole of HCl per liter, while a 1 N solution of HCl contains 1 equivalent weight of HCl per liter.

5. How do you prepare a solution with a specific molar concentration?

To prepare a solution with a specific molar concentration, you will need to calculate the amount of solute needed to achieve the desired concentration. This can be done by rearranging the formula for molarity to solve for n, the number of moles of solute. Then, you can measure out the appropriate mass of solute and dissolve it in the desired volume of solvent to make the solution.

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