LAB 4:
GRAPHING; ACIDS, BASES & pH
NAME:
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PID:
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LAB SECTION: ______________________________________
DATE:
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Points
Table 1
Answers:
1)
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2)
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3)
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4)
0 / 1
Table 2
Answers:
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2)
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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

Graph:
4 solutions
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X-axis & label
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Y-axis & label
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Best-fit line
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Line equation
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- Spring '13
- Magesh
- pts