Answer Posted / bhushan

1)Dissolve exactly 0.53 g of the sodium Carbonate in 20ml of distilled water.
2)Dilute to 100ml . Transfer 10ml of this 0.1N sodium carbonate solution to a 125 ml Erlenmeyer flask.
3)Add few drops methyl orange indicator.
4)Titrate approximately 0.1 N HCl solution into sodium carbonate.
END POINT :- Yellow to Reddish Brown
5) Boil the solution gently for 1min.and them cool at RT by runningtap water over the out side of the flask.If colour changes back to.
orange, titrate more HCl untill the first faint but permanent reddish
brown colour appears in the solution.

Calculations : -
-----------------

0.1 X 10
Normality of HCl = --------------------------
(B.R.) ml. of HCl ti

HI,I CLEARED BOB CLERK EXAM. MY INTERVIEW WILL BE ON 9TH OCTOBER,2010.PLEASE SEND ME INTERVIEW QUESTIONS AND ANSWERS. THANK YOU.

2310

---

Why potassium dichromate is used in calibration of uv?

2039

---

what is mean by dissolution hydrodynamics?

889

---

what is biorelivent dissolution media?

860

---

how pda detector works over uv?

780

---

In Assy by potentio metry titration method how select MET U ,DET U, SET U,

2245

---

what is mean by extactable and leachable study?

1228

---

Ph meter can show more than 14 ph reading? Why ph range in between 1 to 14 only?

799

---

why holium oxide prepared in 10% HCLO4 SOLUTION

1498

---

In GC calibration,what is the procedure to calibrate the TCD (thermal counductivity detector)suggest ?

3226

---

How we can identify process related and degradation impurity in single method with short period?

870

---

if you have given a blank water how you analyse by general analytical techniques?

2086

---

What is the difference between spectro meter and spectro photo meter?

11620

---

What is the purpose of octyl silane columns?

4341

---

Why perchloric acid used for potentiometric titration

2735

---