5g氯化钠配成250ml溶液,求浓度
溶质的物质的量=5/58.5=0.0855mol溶剂的物质的量=495/18=27.5mol溶液的质量=5+495=500 g =0.5Kg溶液的体积=500/1.02=490.2mL=0.4902L溶液的质量摩尔浓度=溶质的物质的量/溶液的质量=0.0855/0.5=0.171mol/Kg物质的量...绛旓細婧惰川鐨勭墿璐ㄧ殑閲=5/58.5=0.0855mol婧跺墏鐨勭墿璐ㄧ殑閲=495/18=27.5mol婧舵恫鐨勮川閲=5+495=500 g =0.5Kg婧舵恫鐨勪綋绉=500/1.02=490.2mL=0.4902L婧舵恫鐨勮川閲忔懇灏旀祿搴=婧惰川鐨勭墿璐ㄧ殑閲/婧舵恫鐨勮川閲=0.0855/0.5=0.171mol/Kg鐗╄川鐨勯噺...
绛旓細銆愮瓟妗堛戯細蟻B=mB锛廣=12锛5g锛0锛25L=50g锛廘蟻B=mB锛廣=12锛5g锛0锛25L=50g锛廘
绛旓細婧惰川鐨勮川閲忓拰婧舵恫鐨勪綋绉浉绛夛紝婧舵恫鐨勭墿璐ㄧ殑閲忔憾娑蹭笌鎽╁皵璐ㄩ噺鎴愬弽姣旓紝鍥犱负K2Co3鐨勬懇灏旇川閲忓ぇ浜嶯a2Co3鎽╁皵璐ㄩ噺锛屾墍浠a2Co3婧舵恫鐨勭墿璐ㄧ殑閲忕殑婧跺害杈冨ぇ
绛旓細A
绛旓細0.1g姘寲閽婧朵簬姘閰嶆垚250ml婧舵恫,姝ゆ憾娑茬殑璐ㄩ噺娴撳害鏄灏戯紵瑙o細娴撳害%=婧惰川g / (婧惰川g+婧跺墏g锛夋祿搴%= 0.1 / (0.1+25) =0.1/25.1 =0.3984 绾︾瓑浜庯細0.4%.
绛旓細250ml 婧舵恫鐨勬憾璐ㄥ氨鏄0.05MOL 0.05molNacl 姘寲閽鐨勫垎瀛愰噺鏄58.5g/mol 寰楀嚭闇瑕2.925g姘寲閽 鐢ㄧ簿纭埌0.1mg鐨勫ぉ骞崇О鍙2.925g姘寲閽狅紝杞Щ鍒250ml瀹归噺鐡朵腑锛岀敤绾寲姘村畾瀹硅嚦鍒诲害锛屽氨鏄垜浠墍闇瑕佺殑婧舵恫銆
绛旓細4gNaOH鏄槸0.1mol锛岄厤鎴250ml婧舵恫 鐗╄川鐨勯噺鐨勬祿搴﹀氨鏄0.1mol/0.25L=1mol/L
绛旓細楂樹腑鐗╃悊鍚堥泦鐧惧害缃戠洏涓嬭浇 閾炬帴锛歨ttps://pan.baidu.com/s/1znmI8mJTas01m1m03zCRfQ ?pwd=1234 鎻愬彇鐮侊細1234 绠浠嬶細楂樹腑鐗╃悊浼樿川璧勬枡涓嬭浇锛屽寘鎷細璇曢璇曞嵎銆佽浠躲佹暀鏉愩佽棰戙佸悇澶у悕甯堢綉鏍″悎闆嗐
绛旓細1銆 姘寲閽鐨勭墿璐ㄧ殑閲 n = m/M = 2.45g/58.44 g/mol = 0.042 mol 2銆 姘寲閽犵殑鐗╄川鐨勯噺娴撳害 c = n/v = 0.042 mol / 0.25 L = 0.168 mol/L
绛旓細20gNaOH鐨勭墿璐ㄧ殑閲=20g/40g/mol=0.5mol c锛圢aOH锛=0.5mol/0.25L=2mol/L 鍙50ml璇婧舵恫锛瀹冪殑鐗╄川鐨勯噺娴撳害涓嶅彉锛屼粛涓猴紙2mol/L锛夊啀鍔犳按绋閲婅嚦100ml锛屽垯绋閲婂悗鐗╄川鐨勯噺娴撳害涓猴紙1mol/L锛2mol/L脳50mL/100mL=1mol/L 璇100ml婧舵恫鍙互璺焎锛圚+锛=1mol/L鐨勭~閰告憾娑诧紙100锛塵l瀹屽叏涓拰 c(...