Based on previous failed attempts, I think the answer is around 5.80x10^-4.
Let m moles of nitrite were present in the original sample.
Absorbance is given by beer lambert's law:
0.3 = x ( m / 23 )
= 6.9 / m
Now,
Moles of nitrite from standard solution added = 10-3 x 10-3 = 10-6
Total moles of Nitrite after dilution = m + 10-6
0.48 = ( 6.9 / m ) x ( m + 10-6 / 52)
3.6174 m = m + 10-6
m = 3.82 x 10-7 moles
Concentration in original solution = 3.82 x 10-7 moles / 0.051 L
Concentration in original solution = 7.49 x 10-6 M
Based on previous failed attempts, I think the answer is around 5.80x10^-4. The method of standard...
My answer is incorrect. The correct answer is 7.14x10^-4, but I am not sure how to calculate it. The method of standard additions was used to determine nitrite in a soil sample. A 1.00-ml portion of the sample was mixed with 22.00 mL of a colorimetric reagent, and the nitrite was converted to a colored product that produced a blank-corrected absorbance of 0.300. To 51.00 mL of the original sample, 1.00 mL of a standard solution of 1.00×10 M nitrite...
The correct answer is 7.14x10^-4, but I am not sure how to calculate it. The method of standard additions was used to determine nitrite in a soil sample. A 1.00-mL portion of the sample was mixed with 22.00 mL of a colorimetric reagent, and the nitrite was converted to a colored product that produced a blank-corrected absorbance of 0.300. To 51.00 mL of the original sample, 1.00 mL of a standard solution of 1.00x10 M nitrite was added. The same...
Please help, I have uploaded variations of this question many times, and no one can get it correct. I appreciate any help. This problem can be done without molar absorptivity. The correct answer is 7.14x10^-4, but I am not sure how to calculate it. The method of standard additions was used to determine nitrite in a soil sample. A 1.00-mL portion of the sample was mixed with 22.00 mL of a colorimetric reagent, and the nitrite was converted to a...
The method of standard additions was used to determine nitrite in a soil sample. A 1.00-ml portion of the sample was mixed with 22.00 mL of a colorimetric reagent, and the nitrite was converted to a colored product that produced a blank-corrected absorbance of 0.300. To 51.00 mL of the original sample, 1.00 mL of a standard solution of 1.00×10 M nitrite was added. The same color-forming procedure was followed, and the new absorbance was 0.480. What was the concentration...
The method of standard additions was used to determine nitrite in a soil sample. A 1.00-ml portion of the sample was mixed with 22.00 mL of a colorimetric reagent, and the nitrite was converted to a colored product that produced a blank-corrected absorbance of 0.300. To 51.00 mL of the original sample, 1.00 mL of a standard solution of 1.00×10 M nitrite was added. The same color-forming procedure was followed, and the new absorbance was 0.480. What was the concentration...