Answer Posted / chanti1984

WAVE LENGTH ACCURACY TEST

what is mean by dissolution hydrodynamics?

808

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WHY pKa value is more important than pH value of the mobile phase in HPLC?

1746

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How can we calculate "confidence interval" in analytical method validation? Pl. explain with example.

4237

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how can I make the copper get white bye any salt or acit?

2191

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How can I develope method of dissolution by HPLC OR UV

2391

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what is the principle involved in turbidometry and nephelometry ?

4151

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analytical method validation require to with respect to release specification or shelf life specification?

766

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what is the importance of peak purity in HPLC and how we can calculate through manul(not software)?

4465

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What is similarity factor and its use in api strength?

1283

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Qc interview questions

1725

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WHAT IS THE PURPOSE WE USE HCL, CHOPPER, BURNER, MONOCHROMATOR in AAS? PLEASE EXPLAIN BRIEFLY

2590

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IS THERE ANY EQUIPMENT TO CHECK AND CALCULATE THE POLARITY OF A LIQUID?

2438

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2. Two grams of Benzoic acid are dissolved in 200 ml of water and extracted with 200 ml of diethyl ether. The distribution coefficient of benzoic acid is 100, and its dissociation constant is 6.5 10-5. Calculate the distribution ratio (D) of benzoic acid at pH 2, 5, and 6. 3. Calculate D at pH 2 to 10 (1 unit apart) in the above problem, and plot D versus pH.

2200

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what is mean by nitrosamine impurities?

1051

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My question about gas chromatography sulfur chemiluminsecence detector. I test unknown sample gas by GC-SCD (calibrated ) and the result of *H2S is 279 PPM , *but when I test the same sample with the GC-TCD (calibrated ) the value of *H2S is 2500 PPM . I'd like to inform you that both GCs are calibrated and have very good operation conditions with stable parameters . the question is if the sample gas with higher H2S over detection limits of SCD detector (1000 ppm). why the result it 279 ppm Best regards

1579

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