Need help with A Level Chemistry question pleaseWatch
of 0.200 mol dm–3 NaCl(aq) with 100 cm3
0.200 mol dm–3 Na2CO3(aq).
What is the total concentration of Na+
ions in the mixture formed?
A 0.100 mol dm–3
B 0.200 mol dm–3
C 0.300 mol dm–3
D 0.400 mol dm–3
I read somehwere that you times 0.200 by 0.1 but I dont understand why.
Hopefully you'll be able to find it from that.
The number of mol of Na+ from NaCl is a 1:1 ratio
The number of mol of Na+ from Na2CO3 is 2:1 ratio (each sodium carbonate dissociates to give two Na+ ions).
Now you have the total number of moles of Na+, convert into a concentration by dividing mol by total volume of mixture (in dm3)