Question

1. A 0.1 M HCl solution was standardized using the indicators Bromothymol Blue (BB), Methyl Red (MR), Bromocresol Green (BG), and Methyl Orange (MO). The results of the experiment are summarized below. Calculate the mean and standard deviation for each indicator. Based on this data, which indicator was best and why? (10 Points)

	Standardized Molarity
Trial	Group 1	Group 2	Group 3	Group 4
1	0.10942	0.1029	0.1293	0.09541
2	0.0954	0.0944	0.1287	0.09651
3	0.09817	0.1055	0.1222	0.09671
4	0.10143	0.09367	0.1375	0.1001
5	0.10196	0.09676	0.12603	0.09962
6	0.09913	0.09749	0.1331	0.1021
Indicator	BB	MR	BG	MO

Answer 1

BBS Indicator maons o log42+0.0954+0.09817t o.10143to.plg6+ o. 04513 20.10og2 standard deccantion = {(x-7772 (n-1) 2.500 5.0114X10 Indicator mR : 0.1029 to ogn440.1055+0.09367 to 09676to.ogths mewn a C 20.09845 Standard deviation = 4.244 6103 Indicator Bus 1233 +0.1267+0:122270137570-12600-1337 = 0.12947 standard deviations r= 5.347 X153 Indicator mo p.09541 0.09651 to 0967 to 10olto 09962+0.1021 20.000841 slawcord deuantan - 2.420 4107 mean = 0.055ha o Here webgle onang is best indicator as its standard so deciation value is seost.