Could you tell me what the melting point for a crystallized sulfanamide is? Also, we will have to determine the m.p. of an impure sulfanamide. Any idea of a temperature range for that? Will it be higher of lower? Probably hard to tell since I don't know what the impurity will be. The lab for crystallization is tomorrow.
Thanks from Sheryl
I was unable to find any reference to sulfanamide in The Merck Index. Is that a class of compounds or is it the name of a distinct compound. As for the melting point, don't you think the melting point of an impure sample will be less than that of the pure sample? (Remember the molal freezing point constants??) And the range may be of the order of 2-5 degrees
Looks like I misspelled it. It is sulfanilamide. Any better luck with that one? It is a sulfa drug.
S
Of course. Even I, of no organic fame, recognize sulfanilamide. mp, according to The Merck Index, is 164.5-166.5 and pKa = 10.43. That tells you the high side of an impure product. Impurities will reduce the melting point because of the molal freezing point behavior.
Just for the fun of it I went to www.google.com and typed in "melting point sulfanilamide" without the quotation marks. I obtained 16,300 hits and the first four gave values ranging from 165 to 167.
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To determine the melting point of a crystallized sulfanilamide, you can refer to reliable sources such as The Merck Index or conduct a search on a reputable website like Google. In this case, The Merck Index states that the melting point of sulfanilamide is between 164.5 and 166.5 degrees Celsius. You can also find additional information by searching for "melting point sulfanilamide" on Google.
When it comes to determining the melting point of an impure sulfanilamide sample, it is likely to be lower than that of the pure sample. This is because impurities can disrupt the crystal structure and decrease the temperature required for melting. The difference in melting points between a pure sample and an impure sample can be determined by comparing their respective temperature ranges.
However, without knowing the specific impurity present in the sulfanilamide sample, it is difficult to estimate the exact temperature range. Generally, it can be expected to be in the range of 2-5 degrees Celsius lower than the melting point of the pure sulfanilamide.
To ensure accurate measurements, it is important to carefully observe the sample during the heating process and record the temperature at which it starts to melt (initial melting point) and when it is fully melted (final melting point). This will help determine the melting point range and assess the purity of the sample.