percentage active ingredient

Welcome to our free

Chemistry Homework Help

forum.

Please read the forums rules before posting.

Find out how you can Help My Chemistry Tutor

[Daniel l]

One question I just cant do!

3.A 1.02 g soluble aspirin tablet is dissolved in water and the active ingredient, acetylsalicylic acid, titrated with 0.500 mol dm-3 sodium hydroxide.  4.43 cm3 of NaOH are required to reach the equilibrium point.  The equation for the reaction is:

C6H4OCOCH3COOH + NaOH   ->  C6H4OCOCH3COONa + H2O

a) Calculate, to the correct number of significant figures, the percentage active ingredient in the tablet.

b) Over what pH range would a suitable indicator have to change colour to be of use in this titration?


Also, does anyone have any alternative answers fo this question


1.  What characteristics should a material have to make it a good standard for a titration reaction?    
                                 
Fast
Complete
Only alternative