Calculate the mass of NaOH needed to make 250ml of 0.200 M aqueous solution?

1 Answer
Mar 6, 2018

2.00 g of NaOH are needed.

Explanation:

Use the formula MV=mol es, where M is molarity in mol/l and V is volume in liters.

First, convert 250 ml to liters by dividing by 1000.

250 color(white)(l)ml-:1000=0.250 liters

Now plug the molarity and volume into the formula:

(0.200)(0.250)=0.0500 mol NaOH

Finally, convert moles into mass. The molar mass of NaOH is 39.997 g/mol.

(0.0500 color(white)(l) mol color(white)(l) NaOH)/1 times (39.997 color(white)(l) g color(white)(l) NaOH)/(1 color(white)(l) mol color(white)(l) NaOH)=2.00 color(white)(l) g color(white)(l) NaOH