Chemistry paper 3 doubts here!!!

[shan5674]

http://www.xtremepapers.me/CIE/Cambridge%20IGCSE/0620%20-%20Chemistry/0620_s04_qp_3.pdf

q4 (iii)

4 a(iii) or b(iii)

I'll explain both anyway..

For a(iii) : Ag+ + Cl- -> AgCl

For b(iii): It would reach a maximum, then fall back to zero. This is because when there is aluminium and NaOh, a precipitate forms which is soluble in excess

Hope I helped guys

Both actually

Thanks

Could u also help with 4b(ii)? thanks

 

[JmCullen]

http://www.xtremepapers.me/CIE/Cambridge%20IGCSE/0620%20-%20Chemistry/0620_s07_qp_3.pdf

Q3 helpp i dont get how im suppose to know the reagent and stuff :/

(i) reagent is sulphuric acid. cuz u need a sulphate.

(ii) HCl

(iii) iodide

But can u explain how you came up with those answers :/ i dont get how im suppose to figure it out

oh!
ok..
hmm.. how i know the answers is just by looking at what they want in the product.

for example, if they want sodium chloride. you can use hydrochloric acid react with sodium hydroxide.

 

[CaptainDanger]

i have a question in no. 5 (b)
http://www.xtremepapers.me/CIE/Cambridg ... 9_qp_3.pdf
plz help quickly !!!!!

5 b is answered HERE