Chemistry, 07.08.2021 14:00 arppy

Để xác định hàm lượng Cu trong hợp kim Cu-Zn người ta làm như sau: Hòa tan hoàn toàn 2,068g mẫu hợp kim Cu-Zn trong lượng dư axit HNO3, thu được dung
dịch X. Đun đuổi axit dư, điều chỉnh tới pH 3 thu được 100mL dung dịch Y. Lấy
10mL dung dịch Y, thêm KI dư, rồi chuẩn độ dung dịch tạo thành bằng dung dịch
Na2S2O3 0,1M thì thấy hết 15,0 mL. Viết các phương trình phản ứng xảy ra. Tính
hàm lượng Cu trong mẫu hợp kim trên.
Giải thích tại sao lại phải đun đuổi axit, điều chỉnh đến pH=3

Answers: 1

Show answers

Another question on Chemistry

Chemistry, 22.06.2019 05:30

What is the mass of 4 molecules of co2

Answers: 1

Answer

Chemistry, 22.06.2019 05:50

What happens when the temperature of a solution increases?

Answers: 2

Answer

Chemistry, 22.06.2019 11:30

Define a is a tiny pavket of energy

Answers: 1

Answer

Chemistry, 22.06.2019 18:00

Heat is the total potential energy of a substance that can be transferred. true false

Answers: 1

Answer

You know the right answer?

Để xác định hàm lượng Cu trong hợp kim Cu-Zn người ta làm như sau: Hòa tan hoàn toàn 2,068g mẫu hợp...

Questions

English, 26.07.2019 21:00

In the middle of the test now. if the final adjective in a series is thought to be part of the noun that follows, you a. use a comma after it. b. ca...

Business, 26.07.2019 21:00

Hi i would like to ask about american high schools like what do you learn as a 9th grader in language arts...

Social Studies, 26.07.2019 21:00

Cultural and linguistic competency is a set of congruent behaviors, attitudes, and policies that come together in a system, in an agency, or among pro...

Social Studies, 26.07.2019 21:00

The conscious or subconscious awareness of external or internal stimuli is a.2. perception, the conscious awareness and interpretation of sensations,...

Social Studies, 26.07.2019 21:00

According to a survey of community relations managers, what is the most important social issue facing communities today? a. housing. b. health care....

Chemistry, 26.07.2019 21:10

The double-slit experiment with electrons demonstrated the surprising realization that? 1. electrons are quanta of energy 2. light behave...

Chemistry, 26.07.2019 21:10

The ammonia concentration of a solution is determined by titrating with aqueous hcl (previously standardized against na2co3) using a ph meter. which o...

Chemistry, 26.07.2019 21:10

If planck’s constant were ten times larger than it is, quantum effects would be? 1. easier to detect 2. more difficult to detect 3....

Chemistry, 26.07.2019 21:10

Which of the following provides evidence for the quantization of light? 1. the individual dots seen on a photographic plate for extremely short...

Chemistry, 26.07.2019 21:10

Which one of the following is not quantized? 1. electric charge 2. electric voltage 3. electromagnetic radiation 4. money...

Chemistry, 26.07.2019 21:10

According to the nonlocality principle? 1. it is impossible to know precisely both the position and velocity of a particle. 2. forces suc...

Chemistry, 26.07.2019 21:10

What happens in the double-slit experiment with electrons if we place a detector behind one of the slits? 14 1. we can then predict the p...

English, 26.07.2019 21:10

Read the following excerpt from stalin's speech: it may be asked: how could the soviet government have consented to conclude a non-aggression pact w...

Geography, 26.07.2019 21:10

Science--what do you think should be done about deforestation in your local forest lands and in rainforests? what can you do to make a change for eac...

Mathematics, 26.07.2019 21:10

State the domain and range of the function f(x) =2[[x]] a. reals even integers. b. reals odd integers. c. reals all integers.

Mathematics, 26.07.2019 21:10

The second termn in a geometric sequence is 20. the fourth termn in the same sequense is 45/4, or 11.225. what is the common ratio in this sequence?...

English, 26.07.2019 21:10

What false assumption does stalin make about people who disagree with his plans? a. they are on the allies' side. b. they are not good fascists. c. t...

English, 26.07.2019 21:10

How does stalin use a bandwagon argument in his speech? a. he says that the people of three continents support his side, so his side must be right. b...

English, 26.07.2019 21:10

Which phrase from stalin's speech most clearly makes an ad hominem attack? a. self-sacrificingly disputing b. demolition of the enemy c. abandon all...

Mathematics, 26.07.2019 21:10

The function f(x)=3267(1+0.02)^x represents the amount of money in a savings account where x represents time in years. what does the 3267 represent?

More questions: Chemistry Another questions