dd X chứa Na2CO3 1,5M, KHCO3 1M. Nhỏ từ từ đến hết 200ml dung dịch HCl 1M vào 100ml dd X thu được V lít khía) Xác định V b) Thêm vào dd sau phản ứng Ba(OH)2 dư thu được bao nhiêu gam kết tủac) Nếu làm ngược lại cho 100ml dd X vào200ml dd HCl 1M thu được bao nhiêu lít CO2

2 câu trả lời

nC03(2-)=nNa2C03=0,15

nHC03(-)=KHC03=0,1

nH(+)=nHCl=0,2

ta có:

C03(2-) + H(+) = HC03(-)

0,15.........0,15....0,15

nHCl dư=0,2-0,15=0,05

HC03(-) + H(+) = C02 + H20

..............0,05..0,05

=> V C02=1,12

Đáp án: 1.12 lít

Giải thích các bước giải:

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