Titration, to remind those who dozed through their chemistry lessons, is a way of workingout the concentration of a substance in a solution.
滴定法是一种计算溶质在溶液中的浓度的方法。
A reagent of known concentration is dripped into the unknown solution in the presenceof an appropriate indicator molecule.
在某种特定的指示分子的参与下,将一种已知浓度的溶液滴到未知溶液中。
When the tipping point comes, and all of the unknown reagent has reacted, the solutionchanges colour.
当滴定终点到来时,所有的未知溶液全都完成了化学反应,溶液的颜色就会发生变化。
The unknown concentration can then be calculated from the amount of known reagentused.
然后未知溶液的浓度就可以通过被消耗掉的已知溶液的体积计算出来。
In Dr Nersesians titration the litmus was a species called the brushtail possum. The tworeagents were predators and poisons.
涅尔谢相博士的滴定实验中的石蕊指示剂是一种叫帚尾袋貂的动物。那两种溶液是猎食者和有毒物。
In the wild, possums feed mainly on eucalyptus trees.
在野生环境下,袋貂主要以桉树叶为食。
Feeding in trees this way also keeps them safe from ground-based predators, such as foxes.
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