Question: Write the chemical reactions showing the neutralizations. Question: As

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Question: Write the chemical reactions showing the neutralizations. Question: As noted above, alkalinity is also a good but imperfect (why?) measure of the total dissolved carbon content. Question: What does polyprotic mean? Question: Why do chemists generally write CO2 (aq) instead of H2 CO3 (aq)? Question: What is the numerical value of K2 for H2 SO4? Question: To what chemical reaction does K2 correspond? Question: Note the distinction between end points and equivalence points. It would be nice if indicators always changed color sharply at the equivalence point of a titration, but they seldom do. Why not?

Explanation / Answer

chemical reactions showing the neutralizations= NaOH +HCL= NaCl+ H20

Carbon dissolved as carbon dioxide is acid, hence alkalinity reduces as dissolved CO2 neutralises any alkaline substance.
It is imperfect as it may not be the only thing that can cause changes like this.

Because in aqueous solution H2O is generally assumed, so if you take H2O out of H2CO3 you get CO2.

You get potassium sulfate:

K2 + H2SO4 ? H2(g) + K2SO4

Equivalence point is when you have actually added the right amount of A to B.

End point is when your indicator changes colour, and is determined by experiment. If the change point of your indicator is not at exactly the same ph as the pH at equivalence, there can be a noticeable difference between these two points. That is why it is important to choose the right indicator.

titration curve exhibits an inflection point at the equivalence

An acid-base indicator (e.g., phenolphthalein) changes color depending on the pH.

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