mình đang làm thí nghiệm phân tích hàm lượng kẽm trong quặng có Cu chuẩn độ tạo phức mà đồng làm ảnh hưởng đến kết quả. Mọi người cho mk hỏi có cách nào phân tích được tối ưu k ạ? và muốn loại bỏ Cu trước khi chuẩn EDTA thì bằng cách nào. Hi vọng nhận được câu trả lời

Giúp em với ạ , em đang cần gấp ai nhanh vote 5* + TLHN ạ

giúp mik, hưas vote 5* và ctlhn

II. Rewrite the sentences without changing the meanings. 1. She urged her husband to apply for the post in the government. - She urged that her husband __________. 2. They advise her to eat less meat and fat to keep herself healthy. - It is advisable that she____________ 3. They recommended her to go to the best doctor in town. - They recommended that she ______________ 4. They insisted on my coming early. - They insisted that_____________ 5. The headmaster insists on every schoolgirl's wearing ao dai every Monday. - The headmaster insists that _____________ 6. Everyone finds it important for us to do something save the environment. - It is important that we________________ 7. He needs to come to the interview early. - It is necessary that_______________ 8. Every student must wear uniform. It is obligatory. - It is obligatory that________________ 9. The man demanded to be told everything about the accident. - The man demanded that________________ 10. "Why don't you ask her by yourself?” - My friend suggests that________________

tính khối lượng sản phẩm thu được khi cho 27g al tác dụng với ddzncl2

Câu 16. If anyone ________, tell them I'm not at home. A. call B. callsC. called D. should call Câu 17. All the applicants for the post are thoroughly ________ for their suitability. A. searched B. vetted C. investigated D. scrutinized Câu 18. They knew that it was just not feasible ______ such a small firm to compete with the big boys. A. in B. at C. for D. about Câu 19. If we lose the case we may be _______________ for the costs of the whole trial. A. compatible B. liable C. available D. accessible Câu 20. _________ is someone who can reduce spending without hurting morale. A. What is needed B. What needs C. Being needed D. That need

Vẽ lục đạo PAIN trong Naruto nhé.

Có 3 dd H2SO4: dd A có nồng độ 14,3M( D=1,43d/ml) . DD B có nồng độ 2,18 M ( D= 1,09 g/ml). DD C có nồng độ 6,1 M ( D= 1,22 g/ml) . Trộn A và B theo tỷ lệ như nào : a) Thể tích bằng bao nhiêu để thu được dd C b) Khối lượng bằng bao nhiêu để thu được dd C

https://img.hoidap247.com/picture/question/20210809/tini_1628515156708.jpg

1. He is no longer late for class. He used ________________________________________________________________.