Other Chemistry Answers

 A 0.8160-g sample containing dimethylphthalate, C6H4(COOCH3)2 (194.19 g/mol), and un-reactive species was refluxed with 50.00 mL of 0.1031 M NaOH to hydrolyze the ester groups (this process is called saponification).

C6H4(COOCH3)2 ⫹ 2OH⫺ : C6H4(COO)2⫺ 2 ⫹ 2CH3OH

After the reaction was complete, the excess NaOH was back-titrated with 24.27 mL of 0.1644 M HCl. Calculate the percentage of dimethylphthalate in the sample.

Before glass electrodes and pH meters became widely used, pH was often determined by mea-suring the concentration of the acid and base forms of the indicator colorimetrically. If bromothymol blue is introduced into a solution and the concentration ratio of acid to base form is found to be 1.43, what is the pH of the solution?

If 1.000 L of 0.1500 M NaOH was unprotected from the air after standardization and absorbed 11.2 mmol of CO2 , what is its new molarity when it is standardized against a standard solu-tion of HCl using 

(a) phenolphthalein?

(b) bromocresol green?

1.0843 g of 8-hydroxyquinoline complexes of mg and Al are present in a sample mixture a residue of al203 and mg0 weighing 0.1344g were found present after the sample is ignited in an open air furnace.find the original mixture