Question

In real-life situations, workers collect water samples in a lake or stream instead of using Samples A and B. For this lab to work, sodium carbonate was added to make the water samples alkaline. In lakes and streams it is calcium carbonate (CaCO3) that causes alkalinity. Calcium carbonate acts as a buffer, a substance that serves to resist small changes in acidity or alkalinity in a solution. When acid rain enters lake water, it can be neutralized by the bases present and thus the lake does not become too acidic. Since the key ion is the hydroxide ion, the nature of the cation doesn't matter

Answer 1

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Answer 2

What is the question here?

Answer 3

well this is what I got for the previous answer Na2CO3 + 2H2O ->2NaOH + H2CO3

Answer 4

Look Salts are classified as normal/neutral, Acidic or basic salts. Both Na2CO3 and CaCO3 are basic salts which upon reaction with water produce NaOH and Ca(OH)2 respectively. NaOH is more stronger base than Ca(OH)2 so it can increase the pH to a greater extent than Ca(OH)2 that is why it is used as an antacid as well. One more thing that Na2CO3 is water soluble but CaCO3 is not. In order to make a laboratory buffer Na2CO2 is a better choice than CaCO3 for the purpose of a basic salt.
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Answer 5

thank you :)