Determine the unknown calcium concentration in a sample of water.
The complex that is initially formed is red. However, it can still be used only if liquid detergents synthetic are used instead of bar and powder detergents. These findings suggest that the water source in the laboratory is very hard. Nonetheless, high levels of total hardness are not considered a health concern.
Repeat this titration with all three trials and record the volume. Titrate with EDTA until a blue color appears. Then, the total hardness of water was then determined to be Make sure it is blue and not purple.
Calcium carbonate concentration expressed in parts per million are usually the criteria for the determination if a particular water sample is hard. Experimental: To begin this experiment, prepare 0. In the reaction with the EDTA, calcium carbonate is converted to calcium chloride.
Now, standardize the EDTA solution. Dilute with water to the mark and mix the solution thoroughly.