Chemistry, 04.09.2021 14:10 dontcareanyonemo
( VietNamese ) Cân 5.219 (g) mẫu thực phẩm, khử nhiễm và định mức đến 100mL (dung dịch 1). Rút 10mL để xác định độ mặn bằng phương pháp Volhard. Thể tích dung dịch AgNO3 0,05N đã dùng là 25mL, thể tích dung dịch KSCN 0,05N đem chuẩn độ với lượng dư AgNO3 thành 12,19 mL. Tính độ mặn thành% NaCl trong mẫu ban đầu và nồng độ (mg / L) của NaCl trong dung dịch 1 ( English ) Weigh 5,219 (g) food samples, decontaminate and make up to 100mL (solution 1). Withdraw 10mL to determine salinity by Volhard method. The volume of 0.05N AgNO3 solution used is 25mL, the volume of 0.05N KSCN solution is titrated with the excess AgNO3 to 12.19 mL. Calculate the salinity to %NaCl in the original sample and the concentration (mg/L) of NaCl in solution 1
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( VietNamese ) Cân 5.219 (g) mẫu thực phẩm, khử nhiễm và định mức đến 100mL (dung dịch 1). Rút 10mL...
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