The same thing is happening as with our bromothymol blue
情況和溴百里酚藍(lán)很類似
but this time when the solution is basic, it's pink
但這次，溶液呈堿性時(shí)，它是粉色
and when it's acidic, it's colorless
呈酸性時(shí)，則是無(wú)色
But why does adding dry ice
那么為什么加入干冰
change the solution from basic to acidic?
會(huì)讓溶液從堿性變?yōu)樗嵝阅?/p>
Well, dry ice is solid carbon dioxide
因?yàn)楦杀枪虘B(tài)二氧化碳
When you add it to water, it bubbles
加到水中時(shí)，它會(huì)冒泡
and part of every bubble of carbon dioxide dissolves
每個(gè)泡泡中都會(huì)有二氧化碳溶解
when it does, it forms carbonic acid. Let's look at that equation
這時(shí)就會(huì)生成碳酸，我們來(lái)看看方程式
So there's more and more carbonic acid in the water
水中的碳酸越來(lái)越多
and this acid reacts with the sodium hydroxide until there's none left
這種酸會(huì)同氫氧化鈉反應(yīng)，一直將其耗盡為止
So the solution becomes acidic
于是溶液變成酸性
So we saw our bromothymol blue
所以我們看到溴百里酚藍(lán)
turning from blue to yellow as a solution became more acidic
隨著溶液酸性越來(lái)越強(qiáng)，從藍(lán)變黃
And we saw our phenolphthalein
而酚酞
turn from pink to colorless as it became more acidic
隨著溶液酸性越來(lái)越強(qiáng)，從粉色變?yōu)闊o(wú)色
Now let's watch again what happens in the final set of cylinders
下面再來(lái)看看最后一組柱形容器中的實(shí)驗(yàn)
Alright, so now, I ask you to focus your attention on this cylinder
好，現(xiàn)在我要求你們注意這個(gè)柱形容器
Actually, you can focus your attention on anything you want to
實(shí)際上，你們也可以關(guān)注別的
You can even not pay attention if you want to
甚至不關(guān)注任何東西都行
We live in a free country
我們生活在一個(gè)自由的國(guó)度
But if you want to follow the experiment with me
但如果你想跟隨我的實(shí)驗(yàn)步伐
I want you to focus your attention on this one
我希望你能關(guān)注這個(gè)
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