Is it possible to find uncertainty for water hardness?

[FlipStyle1308]

Homework Statement

I am told to find the uncertainty for the titration part of determining the water hardness in my chemistry lab. I only have the following data:

By titrating 281.75 mL of titrant, it was determined that 532.08 ppm is the hardness of the water.Also, for water remediation, my contaminant was fluoride, and my remediation agent was 0.005 M Ca(NO3)2 aqueous solution. What is the cheimcal equation describing remediation chemistry, and what is the remediation variable to be studied?

Homework Equations

No clue

The Attempt at a Solution

I cannot find any equations that will help me, since I do not have the "actual" value that I can use to determine uncertainty. If anyone is able to help me, it'd be great. Thanks!

 

[chemisttree]

Ca(NO3)2 <-------> Ca+2 + 2NO3-

Ca+2 + 2F- <---------> CaF2(s)

Ksp of CaF2 = [Ca+2][F-]^2 = 3.45 X 10^-11

Remediation variable = [F-]

 

[Blueshift5]

I would like to clarify that uncertainty is not something that can be "found" but rather it is a measure of the precision and accuracy of a measurement. In this case, the uncertainty for water hardness can be determined by analyzing the sources of error in the titration process, such as human error, instrument error, and environmental factors.

To calculate the uncertainty, you will need to have multiple measurements for the titration process and then use statistical analysis to determine the range of values and the standard deviation. This will give you an idea of the precision and accuracy of your measurement.

In terms of the chemical equation for water remediation, it will depend on the specific remediation method being used. However, in general, the reaction between fluoride and calcium nitrate can be represented as:

2F- + Ca(NO3)2 -> CaF2 + 2NO3-

The remediation variable to be studied in this case would be the concentration of fluoride and the effectiveness of the calcium nitrate solution in removing it from the water.