浓度浓度

Dante was shopping for juice and saw a bottle of juice concentrate. He read the label and learned that some of the water had been removed from the juice before it was bottled, so the concentrate had to be mixed with water before drinking. Next to the bottle of juice was a can of juice. The canned juice was ready to drink. Juice concentrate is an example of a concentrated solution. Ready-to-drink juice is an example of a dilute solution.  
::但丁买的是果汁,看到了一瓶果汁浓缩剂。他读了标签,并了解到一些水在瓶装之前已经从果汁中去除,所以浓缩剂在饮用前必须与水混合。紧接着是果汁罐头。罐头汁已经准备好饮用。果汁是集中溶液的一个例子。准备饮料汁是稀释溶液的一个例子。

Concentrated and Dilute Solutions
::集中和稀释解决方案

A solution is a of two or more substances in which dissolved particles are distributed evenly throughout the solution. The substance that dissolves in a solution is called the solute , and the substance that does the dissolving is called the solvent . The of a solution is the amount of solute in a given amount of solution. A solution with a lot of dissolved solute has a high concentration and is called a concentrated solution. A solution with little dissolved solute has a low concentration and is called a dilute solution.
::溶液是由两个或两个以上物质组成的,溶解颗粒在整个溶液中均匀分布。溶解中溶解的物质称为溶液,溶解的物质称为溶剂。溶解的溶液是一定数量的溶液。溶解溶解溶液的含量很高,并被称为集中溶液。溶解溶解溶液的溶液浓度较低,被称作稀释溶液。

Calculating the Concentration of a Solution
::计算解决方案的浓度

The concentration of a solution represents the percentage of the solution that is the solute. You can calculate the concentration of a solution using this formula:
::溶液的集中度代表溶液溶液溶液的百分率。 您可以使用此公式计算溶液的集中度 :

$\begin{array}{r}\mathrm{C}\mathrm{o}\mathrm{n}\mathrm{c}\mathrm{e}\mathrm{n}\mathrm{t}\mathrm{r}\mathrm{a}\mathrm{t}\mathrm{i}\mathrm{o}\mathrm{n}=\frac{\mathrm{M}\mathrm{a}\mathrm{s}\mathrm{s}(\mathrm{o}\mathrm{r}\mathrm{v}\mathrm{o}\mathrm{l}\mathrm{u}\mathrm{m}\mathrm{e})\mathrm{o}\mathrm{f}\mathrm{S}\mathrm{o}\mathrm{l}\mathrm{u}\mathrm{t}\mathrm{e}}{\mathrm{M}\mathrm{a}\mathrm{s}\mathrm{s}(\mathrm{o}\mathrm{r}\mathrm{v}\mathrm{o}\mathrm{l}\mathrm{u}\mathrm{m}\mathrm{e})\mathrm{o}\mathrm{f}\mathrm{S}\mathrm{o}\mathrm{l}\mathrm{u}\mathrm{t}\mathrm{i}\mathrm{o}\mathrm{n}}\times 100\mathrm{\%}\end{array}$

For example, if a 100-gram solution of salt water contains 3 grams of salt, then its concentration is:
::例如,如果盐水100克溶液含3克盐,其浓度如下:

$\begin{array}{r}\mathrm{C}\mathrm{o}\mathrm{n}\mathrm{c}\mathrm{e}\mathrm{n}\mathrm{t}\mathrm{r}\mathrm{a}\mathrm{t}\mathrm{i}\mathrm{o}\mathrm{n}=\frac{3\mathrm{g}}{100\mathrm{g}}\times 100\mathrm{\%}=3\mathrm{\%}\end{array}$

Q: A 1000 mL container of brand A juice drink contains 250 mL of juice and 750 mL of water. A 600 mL container of brand B juice drink contains 200 mL of juice and 400 mL of water. Which brand of juice drink is more concentrated, brand A or brand B?
::问题:一个1 000毫升的容器,品牌为A果汁饮料,含有250毫升的果汁和750毫升的水;一个600毫升的品牌为B果汁饮料,含有200毫升的果汁和400毫升的水。

A: To solve the problem, calculate the concentration of each juice.
::A:为了解决问题,计算每一果汁的浓度。

$\begin{array}{r}\mathrm{C}\mathrm{o}\mathrm{n}\mathrm{c}\mathrm{e}\mathrm{n}\mathrm{t}\mathrm{r}\mathrm{a}\mathrm{t}\mathrm{i}\mathrm{o}\mathrm{n}(\mathrm{A})=\frac{250\mathrm{m}\mathrm{L}}{1000\mathrm{m}\mathrm{L}}\times 100\mathrm{\%}=25\mathrm{\%}\end{array}$
::浓度(A)=250mL1000mLx10025%

$\begin{array}{r}\mathrm{C}\mathrm{o}\mathrm{n}\mathrm{c}\mathrm{e}\mathrm{n}\mathrm{t}\mathrm{r}\mathrm{a}\mathrm{t}\mathrm{i}\mathrm{o}\mathrm{n}(\mathrm{B})=\frac{200\mathrm{m}\mathrm{L}}{600\mathrm{m}\mathrm{L}}\times 100\mathrm{\%}=33\mathrm{\%}\end{array}$
::浓度(B)=200mL600mLx10033%

You can conclude that brand B is more concentrated.
::你可以得出B品牌比较集中的结论。

Summary
::摘要

播放段落
• The concentration of a solution is the amount of solute in a given amount of solution. A concentrated solution has more solute in a given amount of solvent than a dilute solution.
  ::溶液的集中度是溶液在一定数量的溶液中的溶液量,集中溶液在一定数量的溶剂中溶液比稀释溶剂的溶液更为溶液。
播放段落
• The concentration of a solution can be calculated with this formula:
  ::可用下列公式计算解决办法的集中程度:

$\begin{array}{r}\mathrm{C}\mathrm{o}\mathrm{n}\mathrm{c}\mathrm{e}\mathrm{n}\mathrm{t}\mathrm{r}\mathrm{a}\mathrm{t}\mathrm{i}\mathrm{o}\mathrm{n}=\frac{\mathrm{M}\mathrm{a}\mathrm{s}\mathrm{s}(\mathrm{o}\mathrm{r}\mathrm{v}\mathrm{o}\mathrm{l}\mathrm{u}\mathrm{m}\mathrm{e})\mathrm{o}\mathrm{f}\mathrm{S}\mathrm{o}\mathrm{l}\mathrm{u}\mathrm{t}\mathrm{e}}{\mathrm{M}\mathrm{a}\mathrm{s}\mathrm{s}(\mathrm{o}\mathrm{r}\mathrm{v}\mathrm{o}\mathrm{l}\mathrm{u}\mathrm{m}\mathrm{e})\mathrm{o}\mathrm{f}\mathrm{S}\mathrm{o}\mathrm{l}\mathrm{u}\mathrm{t}\mathrm{i}\mathrm{o}\mathrm{n}}\times 100\mathrm{\%}\end{array}$

Review
::回顾

播放段落
1. What is the difference between a dilute and a concentrated solution?
   ::稀释和集中解决办法有什么区别?
播放段落
2. What is the concentration of a 500 mL solution that contains 5 mL of solute?
   ::含有5毫升溶液的500毫升溶液的浓度是多少?
播放段落
3. James mixed added 25 grams of solute with 75 grams of solvent. Then he calculated the concentration of the solution as: 播放段落
   $$\begin{array}{r}\mathrm{C}\mathrm{o}\mathrm{n}\mathrm{c}\mathrm{e}\mathrm{n}\mathrm{t}\mathrm{r}\mathrm{a}\mathrm{t}\mathrm{i}\mathrm{o}\mathrm{n}(\mathrm{B})=\frac{25\mathrm{g}}{75\mathrm{g}}\times 100\mathrm{\%}=33\mathrm{\%}\end{array}$$
   
   ::浓度(B)=25g75gx10033%
   播放段落

   What error did James make in his calculation? What is the correct concentration of this solution?
   ::James在计算时犯了什么错误?

   
   ::James混合溶液添加了25克溶液,加上75克溶剂。然后他计算溶液的浓度为:浓度(B)=25g75g×10033%。James在计算中犯了什么错误?这个溶液的正确浓度是什么?

Resources 
::资源