Answer Posted / innie

answers #1 and #3 are correct:
it IS possible to convert a lower concentration to a higher
concentration, but you would have to scale up.

for example, if you have 1000 mL of 6N HCl, and you want to
make 1500 mL 8N HCl, you would follow this equation...

(1000 x 6) + 12x = 1500(8)
so 6000 + 12x = 12000
so 12x = 6000, and x = 500

so, add 500 mL 12N HCl to 1 liter 6N HCl to get 1.5 L 8N
HCl.

For standardization of volumetric solutions, acceptance limit for concentration is considered as 10% of nominal concentration and %RSD as NMT 0.2% (for appropriate no. of replicates). But , if %RSD has not met, what should be further action?

1961

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function of detecter in hplc ,gc and spectroscopy? function of carrier gas in gc?

2721

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in hplc chromatogram started from left to right and in uv spectrum started from left to right

1015

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how much mass should be there in volumetric flask while in preparation of sample for assay? 

2664

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WHY given much noise PDA dector then VWD Dector

2144

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I have compare C2H2-air and C2H2-N2O flame AAS on determination calcium. Both use same range of std to plot calibration curve. (2-6ppm) When i measure the sample with phosphate, KCl and LaCl, C2H2-N2O flame give false positive result, around 0.5ppm. When i measure the sample with phosphste, KCl and EDTA. C2H2-N2O flame also give 0.5ppm false positive. But both above mentioned sample would not give false positive when measured by C2H2-air flame. What is the reason?

3579

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If vendor having more imp than monograph then how to proceed? and how to set spec?

1003

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how we can identify the impurity is coming below loq at transfering site?

931

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in api coa contains only process impurities and in product coa contains degradation impurities?

733

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Why six unit used for precision?

1403

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UV and PDA detector, which have less signal to noise ratio?

1177

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we can use expired sample for validation and analyst qualification?

861

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Is it nessesary all multimedia dissolution require descriminatory?

859

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what is the acceptance criteria for enteric coated tablets in 0.1n hcl validation in each parameter?

941

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why we are using hexane in calibration of number of drop per mL

1791

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