Acidity And Alkalinity Of Water Experiment

The science behind water ph.

Acidity and alkalinity of water experiment.

A sample of water collected in the field had a ph of 6 8 which changed to 7 5 by the time the sample was brought to the laboratory. Like acidity alkalinity is a net effect of the presence of several constituents but the most important are the bicarbonate hco3 carbonate co32 and hydroxyl oh anions. Alkalinity of water in this video i explain about the alkalinity of water suggested books for chemistry https amzn to 2lb7q4e engineering chemistry htt. Ph 4 0 is 100 times as acidic as ph 6 0.

How does ph play a role in affecting alkalinity and acidity of a given water sample. H 2 o co 2 h 2 co 3. Compared with the pond water the filtered drinkable water was almost acidic. Alkalinity is determined by measuring how much standard acid must be added to a given amount of water in order to lower the ph to a specified value.

When the ph is above 7 0 the water is alkaline or basic there are more hydroxide ions than hydrogen ions. We can name acidity of water as the base neutralizing capacity and alkalinity of water as the acid neutralizing capacity. We can determine these two parameters using. Ph 7 is neutral and will appear yellow on a litmus test strip.

Many greenhouse operators inject acid e g phosphoric nitric or sulfuric acid into water with problematic high levels of alkalinity. Acidification of water having high ph but low alkalinity is rarely necessary. Lab 4 alkalinity acidity and determination of alkalinity in water 1. You could add several pounds of 8 3ph sodium bicarb and make the same ph impact if you added a much smaller amount of 11 6 ph soda ash.

Jordan university of science and technology faculty of engineering civil engineering department ce 453 environmental lab alkalinity acidity and determination of alkalinity in water experiment 4 student name. Acidification of high alkalinity water. The key difference between acidity and alkalinity of water is that the acidity of water is the water s ability to neutralize a base whereas the alkalinity of water determines water s ability to neutralize an acid. The use of acid injection sh ould be considered very carefully for several reasons.

Since the scale is logarithmic a drop in the ph by 1 0 unit is a 10 fold increase in acidity. Since co 2 controls the ph of the water you can either add co 2 directly to lower ph or you can use acid to convert bicarbonate alkalinity into carbonic acid h 2 co 3 which is just dissolved co 2. Anything orange to red is acidic while green to purple is basic.