Showing posts with label Calculate the mass of sodium acetate (CH3COONa) required to make 500 mL of 0.375 molar aqueous solution. Molar mass of sodium acetate is 82.0245 g mol–1. Show all posts
Showing posts with label Calculate the mass of sodium acetate (CH3COONa) required to make 500 mL of 0.375 molar aqueous solution. Molar mass of sodium acetate is 82.0245 g mol–1. Show all posts

Friday, June 29, 2012

NCERT chemistry 1.5 Calculate the mass of sodium acetate (CH3COONa) required to make 500 mL of 0.375 molar aqueous solution. Molar mass of sodium acetate is 82.0245 g mol–1

Method - 2
mass of sodium acetate = (malrity * molar mass * volume of soultion in ml ) /1000
= .375 * 82.0245 *500/1000 = 15.38 g 

0.375 M aqueous solution of sodium acetate  =  1000 mL of solution containing 0.375 moles of sodium acetate
 
Method - 3 
Number of moles of sodium acetate in 500 mL

                                                                
Molar mass of sodium acetate = 82.0245 g mole–1 (Given)
∴ Required mass of sodium acetate = (82.0245 g mol–1) (0.1875 mole)
Method - 4
You need 500 ml of 0.375 moles/l solution

500ml * 0.375mole/1000ml = 0.1875
moles

1
mole = 82.0245 g

0.1875 moles * 82.0245 g/mole = 15.379 g


take 15.38 g and dissolve to make a 500 ml solution and it will be 0.375 M
Method - 5
first, figure how many moles of sodium acetate / ml of water
you need to produce a 0.375molar sol, do you know your units?

a 1 molar solution = 1mole / litre...

you'll have to forgive chemists for their definitions.

0.375molar solution = 0.375mole / litre

1000mL = 1L

from this : 0.1875moles of sodium acetate multiply by molar

mass and you get your answer.
Method - 6