評(píng)論
打印
Hi, I'm Jessica
嗨，我是Jessica
And I'm going to show you a chemical demonstration that I like to call
這次我要講的化學(xué)演示叫作
let's drink to that
"為此干杯"
Now performing chemistry demos is hard work
進(jìn)行化學(xué)演示并不容易
and MIT's Dr. John Dolhun --
而MIT的John Dolhun博士
here he is --
這就是他
is thirsting
渴望進(jìn)行演示
Let's watch him and his assistant Barry at the Cambridge Science Festival
讓我們看看他和助手Barry在劍橋科學(xué)節(jié)上的演示
Here we've got some Fiji water but
這里有一些斐濟(jì)礦泉水
I think you could try some of my personal favorite tap water as well
不過(guò)我想你可以嘗嘗我個(gè)人最喜歡的飲用水
I think I'm going to stick with it
我想我就喝它吧
You're gonna stick with it? OK, that's fine
你喝它嗎，沒(méi)問(wèn)題
Well, if you'd like, I could treat you to something a little better
如果你愿意的話，我可以請(qǐng)你喝點(diǎn)更好的
What would you like to drink right now?
你現(xiàn)在想喝點(diǎn)什么飲品
A glass of wine?
一杯葡萄酒吧
A glass of wine
一杯葡萄酒
Absolutely
行
Do you have a list, wine list?
你有葡萄酒清單嗎
Yeah
當(dāng)然
You left me with a wine list
這里有一份葡萄酒清單
Is there one particular you like?
你喜歡哪種
Actually, you have a Cabernet on there
你這里列有解百納
fifteen dollars a glass though, Barry
15美元一杯啊 Barry
OK, I got it just for you
沒(méi)問(wèn)題，我請(qǐng)你
One Cabernet
一杯解百納
That's a nice white wine
很不錯(cuò)的白葡萄酒
There's a little red wine in it
里面有一點(diǎn)紅酒
Nice
很好
So Barry turned water into wine
Barry將水變成了葡萄酒
In our video recording of the experiment
在我們的實(shí)驗(yàn)視頻中
the wine doesn't look very red
葡萄酒看起來(lái)不是很紅
but you can see the red color forming at the bottom of the glass
但酒杯底部可以看到一些紅色在形成
He started with a clear colorless liquid that looks like water
杯子里最開始是像水一樣的無(wú)色透明液體
but that actually contains sodium carbonate
但其中其實(shí)含有碳酸鈉
Now in water
在水中
sodium carbonate breaks apart into CO3 2-
碳酸鈉分解為CO3 2-
HC03- and OH-
HCO3和OH-
To go from water to wine
為了從水得到葡萄酒
Barry poured this sodium carbonate solution into a wine glass
Barry將碳酸鈉溶液倒入到葡萄酒杯中
that contained a little bit of the indicator phenolphthalein
而酒杯中包含一些指示劑酚酞
In acidic solution, phenolphthalein is colorless
在酸性溶液中，酚酞是無(wú)色的
but in basic solutions, it's dark pink
但在堿性溶液中，它是暗粉色的
So here's a pH scale
這是pH標(biāo)度
and around 8 on the pH scale
在pH值大約為8時(shí)
phenolphthalein turns pink
酚酞會(huì)變成粉色
So it goes from acidic to basic
這是從酸性變?yōu)閴A性
And the OH ions in Barry's fake water make it basic
Barry的假水中有OH離子，使其呈堿性
So the indicator turns pink
所以指示劑變?yōu)榉凵?/div>
So when mixed with phenolphthalein, the sodium carbonate looks like wine
所以同酚酞混合時(shí)，碳酸鈉看起來(lái)就像葡萄酒
Now let's see what happens next
再看看下面會(huì)發(fā)生什么
Have my own favorite drink milk, you know
嘗嘗我最喜歡的飲品，牛奶
because with cookies and everything, I really love it, so
同餅干這些搭配都很好，我很喜歡它
I'd love to show you that if you...
我希望給你也嘗嘗，怎么樣
Alright, you convinced me, Barry
好，你說(shuō)服了我 Barry
Okay
好
I'll go with milk
我就喝牛奶了
Okay
好
and cookies
還有餅干
I'll get you the cookies afterwards yes
我以后再給你補(bǔ)上餅干
So you just take that for me for a second
先來(lái)喝牛奶吧
