Paulo2014
Sep2-09, 03:10 AM
1. The problem statement, all variables and given/known data
20g of Cr2(SO4)3 was used to make up an 800 ml batch of tanning liquor. When the tanning process was complete, a 10ml sample was taken and the chromium remaining in the sample was determined.
The chromium in the sample was oxidised to dichromate and then titrated with a 0.100molL solution of iron 2 ions.
Given that 16.5ml of the iron solution was needed, determine the percentage of the chromium used up in the tanning process
2. Relevant equations
3. The attempt at a solution
I am unsure as to how to get an answer, I get the number of moles of Cr3+ used in tanning but I don't know how to get a percentage of chromium.
1. The problem statement, all variables and given/known data
2. Relevant equations
3. The attempt at a solution
20g of Cr2(SO4)3 was used to make up an 800 ml batch of tanning liquor. When the tanning process was complete, a 10ml sample was taken and the chromium remaining in the sample was determined.
The chromium in the sample was oxidised to dichromate and then titrated with a 0.100molL solution of iron 2 ions.
Given that 16.5ml of the iron solution was needed, determine the percentage of the chromium used up in the tanning process
2. Relevant equations
3. The attempt at a solution
I am unsure as to how to get an answer, I get the number of moles of Cr3+ used in tanning but I don't know how to get a percentage of chromium.
1. The problem statement, all variables and given/known data
2. Relevant equations
3. The attempt at a solution