# analytical chemistry

posted by .

blank is used to dissipate the error brought about by impurities. What is the other reason of using blank in Mohr method?

• analytical chemistry -

Using the amount of chromate ion calculated to give the best end point gives such an intense yellow color that generally less than the optimum is used; therefore, generally, one must over titrate to get the end point color. The blank helps correct for that excess AgNO3 added to reach the end point. A second reason is that some people/students have trouble seeing the end point. In fact, through my years of teaching, I found that more students had more trouble with the Mohr method than any other procedure and all of it was because of the difficulty in seeing the end point. By using a blank, this problem corrects itself somewhat.

## Similar Questions

1. ### Science

Which of the following is NOT true about the blank for the experiment, 'Analysis of a Complex Iron Salt'?
2. ### Chemistry

Which of the following is NOT TRUE? A. The blank for this experiment must have 100 % transmittance if placed in a spectrometer (Spec 20). B. The volume required to titrate the blank is subtracted from the volume used to titrate the
3. ### chem

Wich of the following is NOT true about the blank for the experiment, 'Analysis of a Complex Iron Salt'?
4. ### Chemistry

Wich of the following is NOT true about the blank for the experiment, 'Analysis of a Complex Iron Salt'?
5. ### chemistry

Wich of the following is NOT true about the blank for the experiment, 'Analysis of a Complex Iron Salt'?

complete to show how you can find the sum by making a ten, hundred, or thousand. 9+5=14 9+1+ blank 10+ blank blank 90+50=140 90+10+blank 100+blank blank 900+500=1400 900+100+blank 1000+blank blank
7. ### help

Introduction to quadratic equations? If you solve the equation by completing the square, fill in the blanks. 9x^2+9x+4=0 x^2+x+blank=-4/9+blank <---- (blank one, both the same) (x+1/2)^2=blank x+1/2= ± √blank <------ blank
8. ### Algebra 2

Introduction to quadratic equations? If you solve the equation by completing the square, fill in the blanks. 9x^2+9x+4=0 x^2+x+blank=-4/9+blank <---- (blank one, both the same) (x+1/2)^2=blank x+1/2= ± √blank <------ blank
9. ### Visual Basic (Computer)

In the following examples, identify the condition a program would detect (the first exercise is solved for you): a. 4 is blank 3 a. greater than b. 8 is blank 8 b. blank c. 17 is blank 17.8 c. blank d. 75 is blank 85 d. blank e. blank …
10. ### chemistry

Complete the following reactions, where applicable. If no reaction occurs write N.R A) blank + blank ---> Cu(NO3)2 + PbSO4 B) C6H12O6 + O2 --> blank + blank C) AgNO3 + CuCI2 ---> blank + blank

More Similar Questions

Post a New Question