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

After cloud droplets form, what must happen to them for precipitation to occur?

In an effort to address concerns about global warming, a power plant in portland, oregon is designed to take all of its exhaust gases from its boilers and recycle the co2 using the solvay process to make sodium hydrogen carbonate. the reaction is shown below. nh3(g) + h2o(l) + co2(g) + nacl(aq) → nahco3(aq) + nh4cl(aq) how many liters each of nh3 and co2 (both at stp) would be consumed to produce 3.00 kg of sodium bicarbonate? the volume of both nh3 and co2 would be

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next