原文: Into a 1000 mL volumetric flask, weight out approximately 15mg (+-0.5mg) strontium nitrate standard, 13.5 mg (+-0.5mg) potassium nitrate standard, 16.5mg (+-0.5mg) ammonium nitrate standard. Record all weights.
原文由 kevinskw 发表: 原文: Into a 1000 mL volumetric flask, weight out approximately 15mg (+-0.5mg) strontium nitrate standard, 13.5 mg (+-0.5mg) potassium nitrate standard, 16.5mg (+-0.5mg) ammonium nitrate standard. Record all weights.