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
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Questions / { chmreddy }
Questions Answers Category Views Company eMail

What are the primary standards?

 6 Analytical Chemistry 11553

How can you prepare 0.05M Ammonium acetate volumetric solution?

 2 Analytical Chemistry 22393

How can you prepare 0.1% Phosphate buffer solution?

 6 Analytical Chemistry 12232

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

 3 Analytical Chemistry 9104

What are the terms used during Melting Range Analysis ?

 2 Analytical Chemistry 3521

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

Mylan,

1 Analytical Chemistry 5079

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

 1 Analytical Chemistry 3039

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

Hetero,

2 Analytical Chemistry 20213



Answers / { chmreddy }

Question { Mylan, 5079 }

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, 20213 }

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