Actually, the
uncertainty point is when we have to estimate one place smaller than what the
graduated cylinder can accurately read. So in this case, the smallest that we
can accurately read is given by the minor marks of 0.2 mL. So if it is in
between two minor marks we can only estimate the number, therefore the
uncertainty is +/- 0.1ml.
Answer : and are the ions formed from the NaCl salt dissolve in water.
Explanation :
The NaCl salt is formed when positive sodium ions bonded to the negative chloride ions.
When NaCl dissolves in water, the negative part of water attract the positive sodium ions and positive part of water attract the negative chloride ions.
Answer:
The pH at the equivalence point is lower than 7
Explanation:
Given the titration involves a strong acid and a weak base
An example is the reaction between ammonia and hydrochloric acid in the aqueous phase
The pH of the base will ordinarily start high and drop rapidly with the additions of acid. As the equivalence point is approached, the pH will change more gradually, until finally one drop will cause a rapid pH transition through the equivalence point.
If a chemical indicator is used—methyl orange would be a good choice in this case—it changes from its basic to its acidic colour.
In strong acid-weak base titrations, the pH at the equivalence point is not 7 but below it. This is due to the production of a conjugate acid during the titration; it will react with water to produce hydronium ions.