can gap lam ne!
1) Khong dc dung them bat cu mot chat hoa hoc nao khac, phan biet cac dd ko mau sau:NaCl, K2CO3, Na2SO4, HCl, Ba(NO3)2. ==> theo minh thi bai nay phai ke bang de phan biet cac chat phai ko.
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NaCl
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K2CO3
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Na2SO4
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HCl
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Ba(NO3)
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NaCl
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K2CO3
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Na2SO4
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HCl
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Ba(NO3)
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