2. A student wants to determine the concentration of phosphate ions in 20.0 mL of water. He prepares 4 solutions that contain a known amount of phosphate as shown in Table 1. He mixes these solutions plus the sample of water with HzSO4, ammonium molybdate and ANSA. The results are shown in Figure 1 below. The final volumes of all tubes are identical. TABLE1 | Amount of Phosphate (umoles) 0 30.0 45.0 100.0 Solution # 4 Solution #1 Solution #2 Solution #3 Solution #4 Sample of drinking water Figure 1: The phosphate standard solutions and the sample of drinking water after the addition of H2SO4, ammonium molybdate and ANSA a) How many umol of phosphate ions are present in the drinking water sample? (Show calculations.) The amount of phosphate will need to be approximated if the intensity of the sample is between the intensities of two standards. Because the final volumes are all identical, an identical intensity indicates an identical # of umoles. b) What is the concentration in micromolarity of the phosphate in the water sample?

Question

Im having difficulty with part A and B of this homework problem, thanks in advance

2. A student wants to determine the concentration of phosphate ions in 20.0 mL of water. He prepares 4
solutions that contain a known amount of phosphate as shown in Table 1. He mixes these solutions plus the
sample of water with HzSO4, ammonium molybdate and ANSA. The results are shown in Figure 1 below. The
final volumes of all tubes are identical.
TABLE1
| Amount of Phosphate (umoles)
0
30.0
45.0
100.0
Solution #
4
Solution #1
Solution #2
Solution #3
Solution #4
Sample of drinking water
Figure 1: The phosphate standard solutions and the sample of drinking water after the
addition of H2SO4, ammonium molybdate and ANSA
a) How many umol of phosphate ions are present in the drinking water sample? (Show calculations.) The
amount of phosphate will need to be approximated if the intensity of the sample is between the intensities of
two standards. Because the final volumes are all identical, an identical intensity indicates an identical # of
umoles.
b) What is the concentration in micromolarity of the phosphate in the water sample?

Image Transcription

2. A student wants to determine the concentration of phosphate ions in 20.0 mL of water. He prepares 4 solutions that contain a known amount of phosphate as shown in Table 1. He mixes these solutions plus the sample of water with HzSO4, ammonium molybdate and ANSA. The results are shown in Figure 1 below. The final volumes of all tubes are identical. TABLE1 | Amount of Phosphate (umoles) 0 30.0 45.0 100.0 Solution # 4 Solution #1 Solution #2 Solution #3 Solution #4 Sample of drinking water Figure 1: The phosphate standard solutions and the sample of drinking water after the addition of H2SO4, ammonium molybdate and ANSA a) How many umol of phosphate ions are present in the drinking water sample? (Show calculations.) The amount of phosphate will need to be approximated if the intensity of the sample is between the intensities of two standards. Because the final volumes are all identical, an identical intensity indicates an identical # of umoles. b) What is the concentration in micromolarity of the phosphate in the water sample?

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