Have have 3 general question regrading Analysis of the hardness of water:
1. What is meant by non-zero blank correction in calculating EDTA?(Whats the effects?)
2. EDTA in an experiment was not dry would it effect the EDTA solution?
3. EDTA in an experiment was not dry would what would be the effect on determining Ca?
Mostly have an question with one.
Two and Three a relatively have an answer.
Okay, then I will provide you with an explanation for 1. This looks like the first experiment that I performed for my Quantitative Analysis course a while back. The answer should be provided in your prelab worksheet or in your Quant. book. The non-zero blank correction accounts for the residual sample left over, in this case EDTA, in the weighing boat, beaker, or weighing paper, etc. when you are adding that sample to something in your next step. You take the weighing boat, beaker, or weighing paper, etc. and reweigh it. The number that you get is your non-zero correction factor.
Sure, I can help you with your questions regarding the analysis of the hardness of water.
1. What is meant by non-zero blank correction in calculating EDTA, and what are the effects?
In the context of calculating EDTA (ethylenediaminetetraacetic acid) for the analysis of water hardness, the non-zero blank correction refers to the adjustment made to account for any impurities or contaminants present in the reagents or the water sample itself.
EDTA is a complexing agent commonly used in titration methods to determine the concentration of metal ions in a solution. It reacts with metal ions, such as calcium (Ca2+) and magnesium (Mg2+), forming stable complexes that can be quantitatively measured. However, some impurities might react with EDTA, leading to inaccurate results.
To correct for these impurities, a blank titration must be carried out. This involves performing the entire titration method with all the reagents, except for the water sample. By subtracting the volume of EDTA solution used in the blank titration from the volume used in the actual titration, the non-zero blank correction can be obtained.
The effects of not applying the non-zero blank correction can result in erroneous measurements of metal ion concentrations. Any impurities or contaminants present might be mistaken for metal ions and falsely increase the calculated concentration, leading to an overestimate of water hardness.
2. If the EDTA in an experiment was not dry, would it affect the EDTA solution?
Yes, if EDTA in an experiment is not dry, it can affect the concentration and accuracy of the EDTA solution. EDTA is usually available as a solid, and its concentration is determined based on its weight. If it is not dried properly or if it absorbs moisture from the environment, its weight can change, affecting the concentration of the EDTA solution.
To ensure accurate results, it is essential to properly dry the EDTA before use. This can be done by heating it to a specific temperature for a calculated period of time to remove any traces of moisture. Consequently, the correct concentration of the EDTA solution can be maintained.
3. If the EDTA in an experiment was not dry, what would be the effect on determining calcium (Ca)?
If the EDTA used in the experiment is not dry, it can result in inaccurate determination of calcium (Ca) concentrations. Ca2+ ions in water can react with EDTA to form a complex, and the amount of EDTA required for complete complex formation is then used to determine the concentration of Ca2+ ions.
However, if the EDTA is not dry, its concentration can be affected (as discussed in the previous question). This means that the ratio of the moles of EDTA to the moles of Ca2+ can be altered, leading to incorrect calculations of the Ca2+ concentration.
Therefore, it is crucial to ensure that the EDTA used in the analysis is properly dried before making any determinations to obtain accurate results for the concentration of calcium ions in the water sample.