Chemistry Paper 33 Purity% answer of CaCO3 and what were the metal and anions

[Mohd Maisam]

yes the ppt was cream. iodide give quite a bright yellow ppt, so i'm pretty sure the ion was bromide. =)

did u test it with pb....it was forming a fully yellow ppt...
i guess u only tried with Ag..

 

[Pals_1010]

Anyone knows the answer to the question whether increasing mass of CaCO3 will give more accurate results?

 

[mujtabashahnawaz]

Anyone knows the answer to the question whether increasing mass of CaCO3 will give more accurate results?

I said no

 

[Aarjit]

Anyone knows the answer to the question whether increasing mass of CaCO3 will give more accurate results?

Increasing the mass(m) of limestone lowers the % error; here's how:

% error = d(m) * 100 ;
clever,eh?...m

[the %purity was inferred in a similar way, i.e. by sectioning the imperial mass with the total mass of CaCO3]

 

[FarahT]

I just did the tables of titration in pencil. Will they reject that? All the rest of the paper is in pen.

 

[fathimaash]

I just did the tables of titration in pencil. Will they reject that? All the rest of the paper is in pen.

i dont think...

 

[Aarjit]

I just did the tables of titration in pencil. Will they reject that? All the rest of the paper is in pen.

No, not if you've written the titer value in ink on the space provided: .............. cm^3 of FA1 reacted with 25.0 cm^3 of FA3/FA5. You're safe.

 

[mujtabashahnawaz]

Increasing the mass(m) of limestone lowers the % error; here's how:

% error = d(m) * 100 ;
clever,eh?...m

[the %purity was inferred in a similar way, i.e. by sectioning the imperial mass with the total mass of CaCO3]

hmm..that was good thinking, now i think i have got my answer wrong

 

[mujtabashahnawaz]

BTW how many marks it had? 2?

 

[Skhan94]

Hey Guys...if a person get A in P1 and P2 but B or C in P3........what would be the overall grade?

 

[littlecloud11]

Increasing the mass(m) of limestone lowers the % error; here's how:

% error = d(m) * 100 ;
clever,eh?...m

[the %purity was inferred in a similar way, i.e. by sectioning the imperial mass with the total mass of CaCO3]

yeah, i said yes, and i was thinking the same thing. =)

 

[egy]

Hey Guys...if a person get A in P1 and P2 but B or C in P3........what would be the overall grade?

overall A inshallah

 

[toxicdevil]

My purity was 90 %. my titration results were very precise.
all my question 2 except the observations was left. As the time finished.

It pains me to discuss past paper. till now I have had bad luck in all paper. Though I had full prepration.

 

[Skhan94]

overall A inshallah

Thanks.!!!

 

[Pals_1010]

Increasing the mass(m) of limestone lowers the % error; here's how:

% error = d(m) * 100 ;
clever,eh?...m

[the %purity was inferred in a similar way, i.e. by sectioning the imperial mass with the total mass of CaCO3]

Yay I wrote the same thing *victory dance*

 

[mujtabashahnawaz]

Yay I wrote the same thing *victory dance*

How much marks it had? 2?

 

[Pals_1010]

How much marks it had? 2?

1 or 2 marks max I think

 

[mujtabashahnawaz]

hmm...Still I can get 28-30 Inshallah!

 

[Pals_1010]

hmm...Still I can get 28-30 Inshallah!

Am sure you will.... God bless

 

[mujtabashahnawaz]

Am sure you will.... God bless

Thanks