Question

Which of the following do you need to know to be able to calculate the molarity of a salt solution?

I. the mass of salt added
II. the molar mass of the salt
III . the volume of water added
IV. the total volume of the solution

Question 13 options:

	I and III only
	I, II, and III only
	II and III only
	I, II, and IV only
	You need all of the information.

Answer 1

Step 1: Answer

i,ii,iv only -------> option(4) is correct

Step 2: Explanation

We know Molarity is defined to be the number of moles of solute divided by volume of solution in liters

Molarity(M)= number of moles of solute / volume of solution ( in L )

So for the calculation of moarity we need total volume of solution hence, option(iv) is correct

since, we need also moles of salt to calculate the molarity and we can calculate the moles of salt by using mass of salt and molar mass of salt

we know, moles = mass / molar mass hence, we need the mass of salt added and the molar mass of the salt

so option (i and ii) both we needed to calculate the molarity