Chemistry Practical 34 GT

[happyperson]

What was the % purity in second question?

 

[UFO_far_planet]

What was the % purity in second question?

What did u get? Sth very low?

 

[Snowysangel]

Can everyone write down their Titre values!

 

[UFO_far_planet]

Can everyone write down their Titre values!

Titres will vary bcoz we used diff amounts of acid, and diff masses of CaCO3. So it's not of much use.
Rather tell me % purity for Q2.

 

[Snowysangel]

Titres will vary bcoz we used diff amounts of acid, and diff masses of CaCO3. So it's not of much use.
Rather tell me % purity for Q2.

No it does matter...there's a specific range for every center I guess. Whet was your mass?

 

[UFO_far_planet]

No it does matter...there's a specific range for every center I guess. Whet was your mass?

I dont remember mass. titre was 24.30 I guess.

 

[happyperson]

What did u get? Sth very low?

Yeah i got a very low value, i got something around 4% i guess. I don't know whether it was actually the case or i messed up in this question.
What's yours?

 

[happyperson]

What were the masses in Q 1 and Q 2?
And titrate value also depends on the volume of HCl taken in the first step, so the range would be 25-30 i guess.

 

[maestro maisam]

For Ques1: I got titre value 23.3 and mass was 2.51g. I got Percentage 83.6%
For Ques2: I got the value of mass 2.o1g and Percentage was 96.5%. I think I messed up with ths one.

 

[happyperson]

For Ques1: I got titre value 23.3 and mass was 2.51g. I got Percentage 83.6%
For Ques2: I got the value of mass 2.o1g and Percentage was 96.5%. I think I messed up with ths one.

What improvements did you suggest and which procedure did you favour in Q 2?

 

[ahlam yume]

i got 24.3cm^3 for the titre

 

[Alihayatlak]

in first part for fb6 ions were magnesium aluminium sulphate and sulphite,im guessing
my titres were 28.5
percentages were 94% n q1 and 4% in q2. i asked people this is right.....
i said exp 1 is less accurate because my cac03 was sticking to the beaker
wbu you guys?

 

[UFO_far_planet]

Yeah i got a very low value, i got something around 4% i guess. I don't know whether it was actually the case or i messed up in this question.
What's yours?

As far as i remember, they had mentioned "Both FB5 and FB1 are from the same limestone", or something similar, right before asking which method is less accurate. How can % purities be so different? Many here got values like 0.5% - 1%. BTW, did u ensure that the flame was blue? CaCO3 has a very high decomposition temperature of about 800 degrees u know.

 

[Saahil Parikh]

I got 11% and 85%

 

[UXm@N]

Titre was 25.6 (may be but it was in 25s), percentage in first 88%, mass loss was hardly any... I heated it for 1 hr exact ad high flame so high that event crucible went black but all I could get was loss of 0.05g so percentage in 2nd was around 6% for me..!! Ions were very easy Mg, Al and So4 or So3(although I wrote So4, forget to wrote so3) Al was discarded when they further said to mention a test(it was adding NaOH), in second part ions were Zn, I and Co3.

Paper was difficult both Q1 and Q2 were tough... MUCH DIFFICULT than variant 33..!! :/ :/ :/ Umeed ha acha ajaenga INSHALLAH!!

 

[happyperson]

As far as i remember, they had mentioned "Both FB5 and FB1 are from the same limestone", or something similar, right before asking which method is less accurate. How can % purities be so different? Many here got values like 0.5% - 1%. BTW, did u ensure that the flame was blue? CaCO3 has a very high decomposition temperature of about 800 degrees u know.

The loss in mass was low, some people i know even got like 2%. My loss in mass was o.o6 i guess.

 

[Bilal Khan]

The loss in mass was low, some people i know even got like 2%. My loss in mass was o.o6 i guess.

Yeah , mine was 0.04 g loss in mass , and i got 4% .

 

[Bilal Khan]

What were the masses in Q 1 and Q 2?
And titrate value also depends on the volume of HCl taken in the first step, so the range would be 25-30 i guess.

I got tire 20.5 , and the supervisor got 21.5 .

 

[Bilal Khan]

Yeah i got a very low value, i got something around 4% i guess. I don't know whether it was actually the case or i messed up in this question.
What's yours?

4.48 % .

 

[Bilal Khan]

in q2 i was hardly getting any loss of mass

same here .