posted by chris
1) The color of bromocresol green indicator is??? when pH < 4, green when pH 4- 5.3 and ???? in pH > 5.3.
2)(A) A student performed the freezing point depression experiment according to directions but mistakenly recorded the mass of lauric acid as 8.300 g instead of 8.003 g. The calculated molar mass of the unknown acid will be ___________ than the true value, because the mass of lauric acid appears in the denominator of the unknown acid's molecular weight determination
Bromocresol green indicator turns from yellow in acid to blue in base.
I am troubled by this question as I indicated in an answer to the same question yesterday. The mass of the lauric acid may appear in the denominator or it may appear another place depending upon how the equations are set up. However, since grams/molar mass = mols, then a larger number for grams will result in a larger number for mols and that will give high results.