请问一下各位,EP药典中Solution A.:Dissolve 6.0 g of sodium dihydrogen phosphate R in 950 mL of water for chromatography R, adjust to pH 7.0 with dilute sodium hydroxide solution R and dilute to 1000 mL with water for chromatography R.
用稀氢氧化钠溶液调pH,稀氢氧化钠的浓度是多少,有相应规定吗?