Câu 17: Hòa tan 17 gam hỗn hợp X gồm 2 kim loại kiềm thuộc 2 chu kì liên tiếp vào 200 ml nước dư thu được 6,72 lít khí H2 ( đktc) và dung dịch Y. a/ Tìm 2 kim loại và phần trăm về khối lượng từng kim loại trong X? b/ Để trung hòa hết ½ dung dịch Y cần dung dịch Z chứa đồng thời HCl và H2SO4 ( có tỉ lệ mol tương ứng 2:1). Tính tổng khối lượng muối thu được sau phản ứng.

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

The missing component to the table to the right or indicated with orange letters complete the table by filling in the corresponding numbers or symbols

Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.