How to solve this titration problems (advance chemistry)?

Posted on 2016-02-18 18:49:00 in Chemistry by ELLIE

1. Calculate the concentration of Cl- from a sample solution of 50 ml by adding 0.1 AgNO3 of 25.00ml. Then put in indicator and titrate with with 0.1 KSCN by using KSCN of 5 ml until end point. 

2. Dissolved mineral of o.5 grams in acid. The iron will be reduced into Fe2+ then titrated with KMnO4 with a concentration of 0.01 M and 35.5 in volume. Find the percentage of Fe in the mineral. 

3. Create a graph from the titration of 100ml HCl 0.1 M in concentration with 0.1 M of NaOH. Choose the appropriate indicator and explain why. 

4. In an experiment the amount of acetylsalicylic acid in an aspirin has the steps as followed: 
Measures the weight of 1 pill = 0.1193. Grind the pill to dust then dissolve in cold etanol of 20 ml. Add phenoftalene 2-3 drop then titrate with standard solution of NaOH 0.1 M of 5.2 ml. Then add NaOH one time as much then add another 10 ml (thus the volume of NaOH added shall be 20.4 ml in total). Heat the solution then left to cool at room temperature. Titrate with a standard solution of HCl of 0.05M of 20ml. Find the percentage of acetylsalicylic acid in one pill of aspirin. 

Acetylsalicylic acid C9H8O4 has the molecular weight of 180.157

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