hàm lượng NaCl có trong nước mắm được xác định bằng phương pháp Morh như sau: lấy chính xác 3ml mẫu, pha loãng bằng nước cất, rồi định mức thành 100ml. hút 20ml dd này cho vào 3 giọt K2CrO4 5% làm chỉ thị, rồi đem chuẩn độ bằng AgNO3 0,055N thì hết 9,5ml. viết các phản ứng xảy ra. tính hàm lượng(g/l) NaCl trong nước mắm. Ag=108,Cl=35,5;N=14,O=16
Answers: 2
Chemistry, 22.06.2019 02:40
Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.
Answers: 2
Chemistry, 22.06.2019 07:20
The diagrams show objects’ gravitational pull toward each other. which statement describes the relationship between diagram x and y? gravity attracts only larger objects toward one another. gravity attracts larger objects only if they are close to one another. if the masses of the objects increase, then the force between them also increases. if distance between the objects increases, then the amount of force also increases.
Answers: 1
Chemistry, 22.06.2019 16:00
What rule is used to determine how many covalent bonds an element can form? a. the number of covalent bonds is equal to six c the number of covalent bonds is equal to five minus the group number plus the group number b. the number of covalent bonds is equal to eight d. none of the above minus the group number select the best answer from the choices provided
Answers: 2
hàm lượng NaCl có trong nước mắm được xác định bằng phương pháp Morh như sau: lấy chính xác 3ml mẫu,...
Mathematics, 30.08.2019 01:30
History, 30.08.2019 01:30
Chemistry, 30.08.2019 01:30
Mathematics, 30.08.2019 01:30
Arts, 30.08.2019 01:30
Mathematics, 30.08.2019 01:30
History, 30.08.2019 01:30
Biology, 30.08.2019 01:30
History, 30.08.2019 01:30
History, 30.08.2019 01:30