During a chemical reaction, you measure the concentration of NaCl at different t

Question

During a chemical reaction, you measure the concentration of NaCl at different time intervals. The data you collect is shown in the table to the right.

                              table:

time in min                         concentration (mol NaCl/L)

0.00                                   0.1500

1.00                                   0.2000

2.00                                   0.250

3.00                                   0.300

4.00                                   0.350

5.00                                   0.400

This data is linear and follows the form y = ax   b where a is the slope of the line and b is the y-intercept. What are a and b for the line fitting the concentration data?

A=mol NaCl/L/ L*Min?

B= Mol/L?

Extrapolating this line, what is the concentration at t = 10.00 minutes?

Explanation / Answer

y = ax + b

At x=0,

0.15 = b

Thus, b = 0.15

At x=1,

0.20 = a + 0.15

Thus, a = 0.05

a = 0.05, b = 0.15

At t=10, y = 0.05(10) + 0.15 = 0.65

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