【单选题】用1g NaOH固体配制成0.5mol/L NaOH溶液,所得溶液的体积是 [ ]
【单选题】500 毫升2:3:1液的配制方案()
A.
5%或10%葡萄糖500ml, 10%氯化钠30ml,5%碳酸氢钠47ml
B.
5%或10%葡萄糖500ml, 10%氯化钠15ml,5%碳酸氢钠24ml
C.
5%或10%葡萄糖500ml, 10%氯化钠20ml,5%碳酸氢钠33ml
D.
5%或10%葡萄糖500ml, 10%氯化钠20ml
【单选题】用95%的乙醇配制75%的乙醇500ml,下面配制正确的是( )。
A.
量取95%乙醇395ml,用水稀释至500ml
B.
量取95%乙醇395ml,加入水105ml,混匀
C.
量称95%乙醇375ml,用水稀释500ml
D.
量取95%乙醇375ml,加入125ml水混匀
【简答题】A little girl was given so many picture books on her sh birthday that her father. Who should have run his office and let her mother run the home, thought his daughter should give one or two of he...
【单选题】实验室需配制一种c (H + )=2mol/L的强酸溶液500mL,下列配制方法可行的是( )
A.
取100mL5mol/LH 2 SO 4 ,加入400mL水
B.
取200mL5mol/LHCl,加水稀释至500mL
C.
取200 mL5mol/LH 2 SO 4 ,加水稀释至500mL
D.
取100 mL5mol/LHNO 3 ,加水稀释至500mL
【单选题】实验室需配制一种强酸溶液500mL,c (H + )=2mol/L,下列配制方法可行的是( )
A.
取100mL5mol/LH 2 SO 4 ,加入400mL水
B.
取200mL5mol/LHCl,加水稀释至500mL
C.
取200 mL5mol/LH 2 SO 4 ,加水稀释至500mL
D.
取100 mL5mol/LHNO 3 ,加水稀释至500mL
【多选题】实验室需配制一种强酸溶液500mL,c(H + )=2mol/L,下列配制方法可行的是( )
A.
取100 mL 5mol/LH 2 SO 4 ,加入400mL水
B.
取200 mL 5mol/LHCl,加水稀释至500mL
C.
取100mL 5mol/LH 2 SO 4 ,加水稀释至500mL
D.
取100mL 5mol/LHNO 3 ,加水稀释至500mL
【单选题】Many a player who had been highly thought of ______ from the tennis scene.
【简答题】直接法配制500mlK2CrO7标准溶液,用500ml( )。