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Chemistry Senior High

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(2) 0 25ml LOXDEVSaites 010cc1 基本例題10 結晶の析出 ◆問題 87 硝酸ナトリウムの水への溶解度は80℃で148.20℃で88 である。 次の各問いに整数値 (29 で答えよ。 (1) 80℃の硝酸ナトリウム飽和水溶液100g には, 硝酸ナトリウムが何g溶けているか。 (2) この水溶液を20℃まで冷却すると, 硝酸ナトリウムが何g析出するか。 TOPR ■考え方 バー 水100g に溶質を溶かしてでき た飽和溶液と比較する。 (1) 同じ温度の飽和溶液どう しでは、次の割合が等しい。 溶質 [g] 飽和溶液 〔g〕 (2) 冷却すると,各温度にお ける溶解度の差に応じた量の 結晶が析出する。 OSHID & 析出量 [g] 20 飽和溶液〔g〕 の式をたてる。 = Lar 解答 合文着中の同せ(1) (1) 80℃では水100g に硝酸ナトリウム NaNO3 が 148g 溶 けて飽和溶液248g ができる。 したがって, 80℃の飽和溶 液100g中に溶けている NaNO3 を x [g] とすると,食号 なので溶質 [g] x [g]__148gx=59.6g 飽和溶液〔g〕 100g 60 g 248g (2) 水 100g に NaNO3 は80℃で148g, 20℃で88g 溶ける overor ので,80℃の飽和溶液 248g を20℃に冷却すると, d Stat ( 148-88) g の結晶が析出する。 したがって, 80℃の飽和 溶液100g からの析出量をy[g] とすると, *+(s) 75mL 49 析出量〔g〕 y[g] (148-88)g 飽和溶液 [ g] 100g = = y=24.18 248g 24g

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English Senior High

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