Answer Posted / whj kdck

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What is the calibration of uv process and preparation

1510

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in which situation ion pair require to use?

281

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if your product is soluble in 0.1n hcl and water then which you choose as media from these 2 media?

280

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

1667

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What is third generation HPLC Columns?

1517

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which are the diffrent batches in the pharmaceuticals?

353

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If change in specification which parameter require to do for validation? if change in chromtographic condition then which parameter? if api change then which parameter? if change composition then which parameter? if old method not work out then whicj parameter? if additional one impurity added then which parameter of validation require to do on above each conditions? elaborate separately

363

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for heavy metal test lead used in which form pure form or any other form for preparation of lead standard sol

5317

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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.

1772

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can we use the same detector in HPLC as well GC and what could be the differences we can find in the final chromato graph in any aspects?

1713

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what is impurity profile. how to interpret this impurity profile to a drug product or drug substance.

2210

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What is the formula to determine the concentration of M of a solution given the % transmittance? Use %T = 43.7 as an example.

2122

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how to set sample and standard concentration in RS method?

366

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what is the structure of DOWEX-50

4931

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if instrument calibration fails then what require to do?

475

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