AI Mentor

Check Your IQ

Free Expert Demo

Try Test

Courses

Dropper NEET Course Dropper JEE Course Class - 12 NEET Course Class - 12 JEE Course Class - 11 NEET Course Class - 11 JEE Course Class - 10 Foundation NEET Course Class - 10 Foundation JEE Course Class - 10 CBSE Course Class - 9 Foundation NEET Course Class - 9 Foundation JEE Course Class -9 CBSE Course Class - 8 CBSE Course Class - 7 CBSE Course Class - 6 CBSE Course

Offline Centres

A student standardizes a solution of ${Na}_{2} S_{2} O_{3}$ by titrating it against a solution containing a known mass of ${NaIO}_{3}$ that has been dissolved in an excess of a freshly prepared solution of KI in dilute $HCI$ . Which of the following errors will lead to a value of the molarity of the thiosulphate solution that is higher than the true value?

see full answer

Your Exam Success, Personally Taken Care Of

1:1 expert mentors customize learning to your strength and weaknesses – so you score higher in school , IIT JEE and NEET entrance exams.

An Intiative by Sri Chaitanya

The student overshoots the endpoint of the titration.

The ${NaIO}_{3}$ is contaminated with $NaCI$ .

The $KI / HCI$ solution is allowed to stand overnight before it is used in the titration.

The sample of sodium thiosulphate pentahydrate used to make the ${Na}_{2} S_{2} O_{3}$ solution had partially dehydrated on standing.

answer is B.

(Unlock A.I Detailed Solution for FREE)

Best Courses for You

JEE

NEET

Foundation JEE

Foundation NEET

CBSE

Detailed Solution

The ${NaIO}_{3}$ is contaminated with $NaCI$ As a result the molarity of the thiosulphate solution is higher than the true value.

The concentration and, thus, the molarity of the solution increase with the amount of solute present. On the other hand, the concentration and molarity decrease in direct proportion to the amount of solvent present.

Hence the correct option is B.

Watch 3-min video & get full concept clarity

courses

No courses found

Result Producing online coaching for JEE/NEET of south India

Largest All India Test Series for JEE/NEET

Best Online Course for IIT JEE

Best Online Course for NEET

Best Online Course for CBSE

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Get Expert Academic Guidance – Connect with a Counselor Today!