Basic calculations- forgot :( (1 Viewer)

[NizDiz]

Just started doing revision for upcoming trials. How would you approach 3 Thanks

 

[nightweaver066]

Since BaNO3 is added in excess, all the sulfate ions have combined with Ba2+ ions to form BaSO4.

Find the number of moles of BaSO4. Now, n(BaSO4):n(SO4 2-) = 1:1 so now you know the number of moles of SO4 2-.

[SO4 2-] = n(SO4 2-)/V = n(SO4 2-)/(0.2) to get your answer.

 

[NizDiz]

where did the 0.2 at the end come from?

 

[Chubbeh]

where did the 0.2 at the end come from?

Volume = 200mL = 0.2L (first thing written) in the question

 

[nerdasdasd]

Volume = 200mL = 0.2L (first thing written) in the question

The volume is always expressed as litres.

 

[NizDiz]

yeh silly me, my bad ahah, thanks for the help champion!!!