End point Equivalence point

In titration,"equivalence point" and "end point" are two differentconcepts, but are easily to make confusion between them.

The equivalence point is the point at which the acid/alkali in the conicalflask is just completely neutralized by the alkali/acid added from the burette.At this point, the amounts of the two reactants (acid and alkali) are said tobe chemically equivalent.

The exact value of the equivalence point cannot be found in a titration, butthe end point is an estimation of the equivalence point. simply speaking, the endpoint is the point at which the titration ends. The end point is usually determinedby the colour change of the indicator, or the turning point of the graph inthermometric titration or conductometric titration.

If the end point is close to the equivalence point, the titration is accurate.


在滴定中，「當量點」和「終點」是兩個不同的概念，但卻容易混淆。

在當量點，盛於錐形瓶中的酸/鹼剛完全被從滴定管所加入的鹼/酸所中和。這狀況下，兩個反應物（酸和鹼）在化學上等當量。

當量點的準確數值並不可能從實驗中求得，但可用終點來估計當量點。簡單來說，終點是滴定終結的一點。通常憑指示劑變色，或者熱量滴定或電導滴定的線圖轉向點，可判定終點。

若終點與當量點接近，滴定是準確的。