Help in Chem P4 !

[Youme&I]

Hey guys can you help me how to do 1(d) from June 02 chemistry p4 here I attached the question paper to make it easier.

I know the graph is going to be decreasing from PH 11.3 to 1 but how to find the ' end point' ... Please help me ..

http://www.xtremepapers.me/CIE/Internat ... 2_qp_4.pdf

 

[intel1993]

hye for end points usulally we use the range of the chosen indicator.....................

Strong acid & weak base methyl orange (endpoint range = 3.5 to 6.5)
Strong Base & weak acid many choices available (endpoint range = 7.5 - 10.5)
Stong Acid & stong Alkali phenophthalien (endpoint range = 4 -10)

may this will help u drawing graphs

 

[Youme&I]

hye for end points usulally we use the range of the chosen indicator.....................

Strong acid & weak base methyl orange (endpoint range = 3.5 to 6.5)
Strong Base & weak acid many choices available (endpoint range = 7.5 - 10.5)
Stong Acid & stong Alkali phenophthalien (endpoint range = 4 -10)

may this will help u drawing graphs

I know that but how to know the end point is at 40cm3 like in the marking scheme?? Help me out

 

[musa]

yar itss like that for 1 mole of NH3 u need 1 mole Hcl as for moles of NH3 its using n=cv (20/1000)*0.2) so volume of 0.004 moles HCl is 0.004/0.1=0.04m3 so volume is 40cm3

 

[Youme&I]

yar itss like that for 1 mole of NH3 u need 1 mole Hcl as for moles of NH3 its using n=cv (20/1000)*0.2) so volume of 0.004 moles HCl is 0.004/0.1=0.04m3 so volume is 40cm3

thankz! now I get it cheers