What weight of sodium carbonate will be required to prepare 250 mL of 0.05 N solution of sodium carbonate?

What mass of sodium carbonate would be required to prepare 250 ml of 0.1 M sodium carbonate?

please help and explain it to me, i really dont understand

you have a volume and a concentration so work out the moles n = (C x V)/1000

Then work out the mass m = n x Mr (you know that sodium carbonate is Na2CO3 so use the periodic table to work out the Mr)

(Original post by wag12k12dunkno)

What mass of sodium carbonate would be required to prepare 250 ml of 0.1 M sodium carbonate?

please help and explain it to me, i really dont understand

Hope this helps

(Original post by Munrot07) you have a volume and a concentration so work out the moles n = (C x V)/1000

Then work out the mass m = n x Mr (you know that sodium carbonate is NaCO3 so use the periodic table to work out the Mr)

(Original post by 4evershinee)
Okay, so here is how you do it

Hope this helps

(Original post by wag12k12dunkno)
thanks so much! i just did it before the reply but this was very clear, cheers

(Original post by 4evershinee)
No probs

What mass of calcium chloride would be required to prepare 2 litres of 0.5 M calcium chloride So do i find out the moles so (2*0.5)/1000= 0.001 so then moles= mass/molar mass so mass= moles* molar mass molar mass of cacl2 is 111 so 0.001*111= 0.111

i know iv gone wrong somewhere here

(Original post by Munrot07) you have a volume and a concentration so work out the moles n = (C x V)/1000

Then work out the mass m = n x Mr (you know that sodium carbonate is Na2CO3 so use the periodic table to work out the Mr)

(Original post by wag12k12dunkno)

What mass of calcium chloride would be required to prepare 2 litres of 0.5 M calcium chloride So do i find out the moles so (2*0.5)/1000= 0.001 so then moles= mass/molar mass so mass= moles* molar mass molar mass of cacl2 is 111 so 0.001*111= 0.111

i know iv gone wrong somewhere here

Remember that ml=cm3 they're both the same.

(Original post by wag12k12dunkno)
please help with next question im not sure where i went wrong i dont know if i had to divide by 1000 or not

(Original post by cleveradam) convert L to ML = 2L = 2000ML 2000 X 0.5/1000= 1 1 x 111 = 111

Remember that ml=cm3 they're both the same.

(Original post by Munrot07)
you only divide by 1000 if you have cm^3 because you need it in dm^3. If the volume is in dm^3 do not divide by 1000. 1dm^3 = 1 litre

(Original post by Munrot07)
you only divide by 1000 if you have cm^3 because you need it in dm^3. If the volume is in dm^3 do not divide by 1000. 1dm^3 = 1 litre

moles= mass/molar mass dw i was being dumb

(Original post by Munrot07)
you only divide by 1000 if you have cm^3 because you need it in dm^3. If the volume is in dm^3 do not divide by 1000. 1dm^3 = 1 litre

You need to prepare 2.500 L of 1M sodium carbonate. What mass of sodium carbonate is required for this solution?

(Original post by wag12k12dunkno)
thanks so much! i just did it before the reply but this was very clear, cheers

(Original post by mrcullen) You need to prepare 2.500 L of 1M sodium carbonate. What mass of sodium carbonate is required for this solution?

can u fix this one?

and I got for my question 264.975 g/mol so could check out for me please ?

(Original post by mrcullen) You need to prepare 2.500 L of 1M sodium carbonate. What mass of sodium carbonate is required for this solution?

can u fix this one?

and I got for my question 264.975 g/mol so could check out for me please ?