He also knew that wheat has an enzyme called oxalate oxidase, which detoxifies oxalic acid.

他也清楚，小麦有一种草酸氧化酶，能够分解草酸。

Oxalic acid reacts with rust to form iron oxalate complex ion.

草酸与铁锈反应生成草酸铁络合物。

Dr Powell knew that many of the symptoms of chestnut blight are caused by the oxalic acid that C. parasitica generates as it grows.

鲍威尔知道，栗疫病很都由栗疫病菌生长产生草酸引起。

It's when we run out, excuse me, it's when we've run out of that oxalic acid.

当我们用完, 对不起, 当我们用完草酸。

How could we work backwards to find that analyte which is going to be this oxalic acid up here?

我们如何倒退找到分析物, 它就是上面草酸?

Well in the beginning as we add that sodium hydroxide, it's reacting with the oxalic acid.

一开始, 当我们添加氢氧化钠, 它会与草酸发生反应。

I've now gotten moles of oxalic acid.

我现在已经得到了几摩尔草酸。

In this case it was oxalic acid.

在这种情况下, 它是草酸。

And let's say our analyte is going to be, analyte is going to be this oxalic acid down here.

假设我们分析物将是, 分析物将是这里草酸。

It can't combine with this oxalic acid anymore.

它不能再与这种草酸结合。

And let's say we're combining that with oxalic acid.

假设我们将其与草酸结合。

This is the number of grams of oxalic acid that we had to begin with.

这是我们一开始需要草酸克数。

Let's say how much of the analyte, let's say this oxalic acid is present.

假设有少分析物, 假设这种草酸存在。

So I'm going to put the moles of sodium hydroxide on the bottom and the moles of oxalic acid on the top.

所以我要把氢氧化钠摩尔放在底部, 把草酸摩尔放在顶部。

" Sugar acid" ! said the chemist contemptuously, " don't know it; I'm ignorant of it! But perhaps you want oxalic acid. It is oxalic acid, isn't it" ?

" 糖酸？" 药剂师作出内行瞧不起外行神气说，" 我不知道，没听说过！ 你恐怕是要买草酸吧？ 是草酸，对不对？"

Substances like these aren’t intoxicating, they’re just poisonous, usually because your body metabolizes them into some horrible, dangerous compound like formic acid or oxalic acid.

这类物质不会让人醉酒， 只是有毒，通常是因为你身体会将它们代谢成一些可怕危险化合物， 比如甲酸或草酸。

Now all I have to do, I've got to go down to the next line, is I have to get that to the grams of that oxalic acid.

现在我所要做, 我必须进入下一行, 我必须得到草酸克数。