L04 WORK Graphing_Acids-Bases-_-pH (1).docx - LAB 4 GRAPHING ACIDS BASES pH NAME PID LAB SECTION DATE Points PART A GRAPHING STANDARD CURVES UNKNOWN

L04 WORK Graphing_Acids-Bases-_-pH (1).docx - LAB 4...

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LAB 4: GRAPHING; ACIDS, BASES & pH NAME: ______________________________________ PID: ______________________________________ LAB SECTION: ______________________________________ DATE: ______________________________________
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Points Table 1 Answers: 1) 0 / 1 2) 0 / 1 3) 0 / 1 4) 0 / 1 Table 2 Answers: 1) 0 / 1 2) 0 / 1 3) 0 / 1 4) 0 / 1 Table 1Work0 / 0.5 / 1 Table 2Work0 / 0.5 / 11.Calculate the % concentration (w/v) of the four standard solutions in Table 1. Show your work below for standard solution #4 and put the answers in Table 1above.2.To determine the densities of the four standard solutions, the mass of 10.0 mL of each was measured using a balance. Data are shown in Table 2above. Use these data to calculate the density of each of the standard solutions. Show your calculations below for standard solution #4 and put the answers in Table 2above. ________pts /10 pts PART A: GRAPHING, STANDARD CURVES, UNKNOWN SOLUTIONS In this exercise, we will first calculate the concentrations of four standard solutions from data provided. Next, we will calculate the densities of these standard solutions from measurements of their weights. We will then construct a standard curve graph and use it to determine the concentrations of unknown solutions whose densities were also determined. The goals of this exercise are to understand the concept and usefulness of standard curves and acquire practical experience in making and using graphs to analyze and interpret scientific data. Table 1 : Preparation of four standard solutions. Standard Solution # Concentration % NaCl (w/v) NaCl (g) Final Volume (mL) 1 0.0 50 2 2.5 50 3 5.0 50 4 7.5 50 Table 2 : Density of the four standard solutions. Standard Solution # Mass of 10.0 mL of solution (g) Density (g/mL) 1 9.85 2 10.25 3 10.58 4 10.96 2
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Graph: 4 solutions 0 / 0.5 / 1 X-axis & label 0 / 0.5 / 1 Y-axis & label 0 / 0.5 / 1 Best-fit line 0 / 0.5 / 1 Line equation 0 / 0.5 / 1
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