Chemistry Question

Question

How many grams of NaCl (molecular weight = 58.5g mole^ -1) would you dissolve in water to make a 1M NaCl solution with 1-liter final volume ?

Answer 1

I like to write what I am given in the problem and what I need to find.

Givens:

1 M NaCl Solution

Final volume = 1L

MW (NaCl) = 58.44g/mole

Find:

grams of NaCl

By using the formula for molarity we can solve this problem.

Molarity (M) = moles of solute (moles) / Liters of solution (L)

Step 1: Find the number of moles of solute (NaCl).

Moles of solute (NaCl) = Molarity (Moles/Liter) X Liters of Solution

Moles of NaCl = 1 M NaCl X 1 L

= 1 mole NaCl

Step 2: Using the number of moles, solve for the number of grams of NaCl needed.

1mole NaCl X (58.5g/1mole) = 58.5g of NaCl needed