(a)
Interpretation:
The given data needs to be plotted using the spreadsheet including the least-squares line assuming a linear relationship between instrument reading and concentration.
Concept introduction:
The quality of water can be measured by turbidity. The degree in which the transparency of water is lost is known as turbidity. Ther higher the suspended solids, the higher is the turbidity of the water. It is measured by turbidimeter and the unit is Nephelometric Turbidity Units.
(b)
Interpretation:
The slope and intercept of the straight line from the graph needs to be determined.
Concept introduction: The quality of water can be measured by turbidity. The degree in which the transparency of water is lost is known as turbidity. Ther higher the suspended solids, the higher is the turbidity of the water. It is measured by turbidimeter and the unit is Nephelometric Turbidity Units.
(c)
Interpretation:
For the slope and intercept of the graph, standard deviation needs to be determined.
Concept introduction:
The quality of water can be measured by turbidity. The degree in which the transparency of water is lost is known as turbidity. Ther higher the suspended solids, the higher is the turbidity of the water. It is measured by turbidimeter and the unit is Nephelometric Turbidity Units.
(d)
Interpretation:
The concentration of the sulfate in the sample at turbidimeter reading 3.67 needs to be determined. The absolute standard deviation and coefficient of variation needs to be calculated.
Concept introduction:
The quality of water can be measured by turbidity. The degree in which the transparency of water is lost is known as turbidity. Ther higher the suspended solids, the higher is the turbidity of the water. It is measured by turbidimeter and the unit is Nephelometric Turbidity Units.
(e)
Interpretation:
Assuming 3.67 as mean of six turbidimeter readings, the calculations in part (d) needs to be repeated.
Concept introduction:
The quality of water can be measured by turbidity. The degree in which the transparency of water is lost is known as turbidity. Ther higher the suspended solids, the higher is the turbidity of the water. It is measured by turbidimeter and the unit is Nephelometric Turbidity Units.
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Chapter A1 Solutions
PRINCIPLES OF INSTRUMENTAL ANALYSIS
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- The alcohol content of a certain low alcohol beer was determined using volumetric analysis. In this analysis, a 17.1-mL sample of the beer was pipetted into a 100-mL volumetric flask and the solution was made up to the mark. Then 20.4 mL aliquots of his solution were titrated against acidified potassium dichromate solution, K,Cr,0, of concentration 0.077 mol/L. A mean titre (or volume of the titrant) of 19.9 mL was obtained. The equation for the analysis is: 2- 3+ 2 Cr,0," (aq) + 3 C,H,OH (aq) + 16 H (aq) = 4 Cr (aq) + 3 CH,COOH (aq) + 11 H,0 (I) What was the molarity of the alcohol in the beer?arrow_forwardPhosphate-buffered saline (PBS) is a solution commonly used in studies of animal tissues and cells. Its composition is 137 mM NaCl, 2.7 mM KC1, 10 mM Na, HPO, (pK, = 2.14), and 1.8 mM KH₂PO, (pK, = 6.86). Calculate the pH and osmolarity of PBS. Give the osmolarity in units of osmoles per liter (osm/L). pH = 7.605 osmolarity 313.0 Incorrect osm/Larrow_forwardCalculate the concentration of HNO3 (aq). Estimate the Kb for C2H5NH2 (aq) using the titration curve.arrow_forward
Principles of Modern ChemistryChemistryISBN:9781305079113Author:David W. Oxtoby, H. Pat Gillis, Laurie J. ButlerPublisher:Cengage Learning
Chemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage Learning