Nhận bt nano3, nacl,hcl phương pháp hoá học

2 câu trả lời

Đáp án:

 - lấy mẫu thử
-cho quỳ tím lần lượt vào các mẫu thử:
+ quỳ tím hóa đỏ: HCl
+quỳ tím không hiện tượng: NaCl,NaNO3
- cho dd AgNO3 vào các mẫu thử không hiện tượng:
+ có kết tủa trắng: NaCl
+không hiện tượng NaNO3
PTPƯ: AgNO3 + NaCl ==} NaNO3 + AgCl

 

Đáp án + Giải thích các bước giải:

)Lấy một ít mẫu thử từ các chất.

) Dùng quỳ tím nhúng vào các mẫu.

-) Quỳ tím chuyển sang màu đỏ HCl

-)Quỳ tím khônng chuyển  màu NaNO3NaCl

-) Cho AgNO3 tác dụng với 2 mẫu trên , phản ứng sinh ra kết tủa là NaCl,còn lại là NaNO3

NaCl+AgNO3NaNO3+AgCl(kết tủa)

Câu hỏi trong lớp Xem thêm

Làm ơn giúp mik ạ I.Choose the word which has underlined part is pronounced differently from the others. 1. A. chores B. dishes C. houses D. coaches 2. A. laughed B. stamped C. booked D. connected 3. A. lively B. style C. poetry D. symbol 4. A. about B. found C. bought D. south 5. A. teacher B. scholarship C. chair D. chess II. Circle the best option ( A, B, C or D) to complete each sentence 1. I don’t have a car. I wish I ________one. A. have B. didn’t have C. had D. wouldn’t have 2. Many students enjoy ________videogames. A. to watch B. watching C. watch D. to watching 3. The church _________ about 100 years ago. A. was built B. is built C. has been built D. will be built 4. He can’t get home______he has a ticket. A. if B. until C. unless D. without 5. It’s so hot . Why don’t we go swimming ? ________ A. Yes, we do B. No, we don’t C. That’s a good idea. D. Yes, thanks 6. He asked her __________ A. when she leaves the party. B. when did she leave the party. C. when does she leave the party. D. when she left the party 7. The journey to the village is very _______________ A. interested B. interesting C. uninterested D. interest 8. We should follow the traffic rules strictly, ________ ? A. shouldn’t we B. don’t we C. should we . D. should not we 9. The woman _______ lives next door is both my neighbor and a colleague of mine. A. which B. where C. whom D. who 10. He is tired ________ he stayed up late watching TV. A. so B. because C. but D. and III. Choose the words or phrases that are not correct in Standard English and correct the mistakes. 1. Every student in my class are good at English. -> ……………. 2. He studied very hard, so he passed the exam easy. -> ……………. 3. He said that he has done his homework since 7 o'clock. -> ……………. 4. The boy which was given the first prize in the contest was very happy. -> ……………. 5. Despite my father is old, he still goes to work. -> ……………. IV. Give the correct form of the verbs: 1. We (not see)......................Nga since Monday. 2. Do you mind(tell)....................me her address? 3. The letter I (receive)......................yesterday is on the desk. 4. A new bridge (build)...........................in my village next month. 5. I (learn).......................French at the moment,but I have not spoken it very well yet.

2 lượt xem
1 đáp án
21 giờ trước