chemistry
Based on the experimental data, I was able to calculate the experimental pKa value which is 5.04 and the literature value of the pKa for KHP is 5.51. If I would be computing for the relative error between the two pKa's it would be 8.52994555%. But then, what i need is the ...
chemistry
what does it mean if I got a % relative error that is higher than 100%? - would it mean that I did the experiment erroneously?
chemistry
The phosphorus in a completely dried fertilizer sample weighing 0.4498 grams was precipitated as MgNH4PO4*6H2O. The precipitate weight was determined to be 236.8 mg and ignited to Mg2P2O7. The weight of the ignited precipitate was 268.9 mg. Calculate the percent phosphorus. My...
chemistry
So, the moisture content (as received) is ((0.5117-0.4998)/0.5117)* 100 = 2.326% and the the moisture content (dry basis) is ((0.1*0.4998)/0.5117)*100 = 9.767% and when the sample is completely dried, it would weigh 0.4998-(0.1*0.4998) = 0.4498 Am I right?
chemistry
Please help me through this problem... A 0.5117 gram fertilizer containing phsphorus was oven dried. The weight of the dried sample is 0.4998 grams. However, 10% moisture is still retained in the sample. Calculate the moisture content in the sample in as received and dry basis...
chemistry
Please help me with my formal report on "Potentiometric Determination of the Purity and Dissociation Constant of Potassium Hydrogen Phthalate" Please give me links to websites that could be used for my reference... In addition, please do suggest books that discuss po...
chemistry
Again, from my previous question about gravimetric analysis... Why can't NH4Cl be used as a substitute for NH3 in precipitating MgNH4PO4*6H2O? Please critique my thought: I found out that a precipitate is more soluble at lower pH and since NH4Cl acidic, it will cause the p...
chemistry
In precipitating magnesium ammonium phosphate, why can't NH4Cl be used as a substitute for NH3? Isn't pH critical? The solubility is vastly different at pH 9 versus pH 4. In addition, how do you obtain NH3 from NH4Cl? The NH3 is for pH adjustment as Bob Pursley writes.
chemistry
Experiment: Gravimetric Determination of Phosphorus in Fertilizer Samples 1. Can NH4Cl be used as a substitute to precipitate the phosphorus in the sample? Why or why not? - I think, NH4Cl can be used although I'm not quite sure if Cl- ions have some effects to the precipi...
chemistry
experiment: Gravimetric determination of moisture in fertilizer samples 1. What are the advantages of weighing by difference to direct weighing when using an analytical balance? 2. Why are the samples grinded before drying in the oven? Weighing by difference minimizes errors i...
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