Interview Questions Answers in Analytical Chemistry

chmreddy

{ City } sangareddy
< Country > india
* Profession * asst. manager
User No # 97189

Total Questions Posted # 8
Total Answers Posted # 2

Total Answers Posted for My Questions # 23
Total Views for My Questions # 99149

Users Marked my Answers as Correct # 14
Users Marked my Answers as Wrong # 11

Questions / { chmreddy }

Questions Answers Category Views Company eMail

What are the primary standards?

6 Analytical Chemistry 13287

How can you prepare 0.05M Ammonium acetate volumetric solution?

2 Analytical Chemistry 24854

How can you prepare 0.1% Phosphate buffer solution?

6 Analytical Chemistry 14310

Calculate the water content in Di Sodium Tartrate (DST) based on molecular weight?

3 Analytical Chemistry 10709

What are the terms used during Melting Range Analysis ?

2 Analytical Chemistry 4397

As per USP u/vacuum means (how much vacuum should be applied)?

Mylan,

1 Analytical Chemistry 5979

Why should we use Potassium iodide and Hydrochloric acid during preparation of Iodine Molar solution?

1 Analytical Chemistry 3827

How can you calculate manually "Slope" in pH calibration?

Hetero,

2 Analytical Chemistry 21786

Answers / { chmreddy }

Question { Mylan, 5979 }

As per USP u/vacuum means (how much vacuum should be applied)?

Answer

“Vacuum” denotes exposure to a pressure of less than 20 mm of mercury (2.67 kPas), unless otherwise indicated.

Is This Answer Correct ?

1 Yes

0 No

Question { Hetero, 21786 }

How can you calculate manually "Slope" in pH calibration?

Answer

A good electrode has a mV of 0 ± 30 mV in pH 7.
The slope should be 90 to 105%.
Example:
Readings
pH 4 : 4.29
pH 7 : 7.43
Convert pH 7 reading to mV
7 – 7.43 = -0.43 pH * 59.16 mV/pH = -25.44 (this value is okay because it is within 0 ± 30mV)
Convert pH 4 reading to mV
7 – 4.29 = 2.71 pH * 59.16 mV/pH = 160.32
Calculate slope
160.32 – (-25.44) = 185.76 mV/ 177.48 mV * 100 = 105 %
(this value is borderline as 105% is the upper limit)

Is This Answer Correct ?

13 Yes

11 No