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Bằng PPHH ,hãy nhận biết 3 đ NaOH , HCl , H2SO4 trong 3 lọ đựng riêng biệt .

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Quang Cường

Đưa quỳ tím vào 3 dd. NaOH hoá xanh, HCl và H2SO4 hoá đỏ. Nhỏ BaCl2 vào 2 dd còn lại. H2SO4 có kết tủa, HCl ko hiện tượng

BaCl2+ H2SO4 -> BaSO4+ 2HCl

Mẫn Hưởng

2 năm trước

Đáp án:-đánh Stt, trích mẫu thử

-cho tất cả các chất tác dựng với quỳ tím

+xanh: NaOH

+đỏ: HCL, H2SO4

- cho các chất còn lại tác dụng với BaCl2

+kết tủa:H2SO4

+Ko phản ứng :HCl

Giải thích các bước giải:

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Bằng PPHH ,hãy nhận biết 3 đ NaOH , HCl , H2SO4 trong 3 lọ đựng riêng biệt .

2 câu trả lời

if you don't wear a helmet , you can't ride your bike => Unless

Choose the best answer.
I think you should buy ___ pack of mineral water instead. And you can also buy _ snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ____ cookies and soft candies.

Choose the best answer.
We should decorate our living room with _ orange banner. We also need ____ ribbons, balloons, party hats and costume.

Choose the best answer.
I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.

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Bằng PPHH ,hãy nhận biết 3 đ NaOH , HCl , H2SO4 trong 3 lọ đựng riêng biệt .

2 câu trả lời

if you don't wear a helmet , you can't ride your bike => Unless

Choose the best answer.I think you should buy _____ pack of mineral water instead. And you can also buy _____ snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ______ cookies and soft candies.

Choose the best answer.We should decorate our living room with _____ orange banner. We also need ________ ribbons, balloons, party hats and costume.

Choose the best answer.I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.

Đề thi - đề kiểm tra Xem thêm

Choose the best answer.
I think you should buy ___ pack of mineral water instead. And you can also buy _ snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ____ cookies and soft candies.

Choose the best answer.
We should decorate our living room with _ orange banner. We also need ____ ribbons, balloons, party hats and costume.

Choose the best answer.
I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.