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chem strengths of acids
點諗都諗唔明。。。 http://postimg.org/image/3tsd27t0z/ 更新: 不好意思啊！為甚麼CH3COOH的pH會計到2.4呢？ 更新 2: hydroxide ions and hydrogen ions. Any difference? 其實CH3COOH 和H2SO4的分解是甚麼原理呢？為何沒有O2ions在裏面喇？ 更新 3: 唔該！你很細心！中英並用的為我解釋！哈sorry我用錯了分解，應是離解。。。謝謝你的指導！但是如過現在不用學計weak acids 的pH，但我那條又想解釋返，那該怎麼辦？ 真的真的麻煩你啊！ 更新 4: 也謝謝gg的answer!你也很用心！
最佳解答:
Thestatement is incorrect. 敘述句錯誤。 The concentration of hydrogen ions in a solution of an acid depends on not onlythe strength of the acid, but also the concentration of the acid. A moreconcentrated solution of a weaker acid may have a lower pH than a lessconcentrated solution of a stronger acid. 酸溶液中的氫離子濃度不僅受酸的強度影響，還受到濃度的影響。濃度較高的較弱酸溶液的 pH 可能低於濃度較低的較強酸溶液。 For example, HCl is a strong acid, while CH3COOH is a weak acid. pH of 0.001 M HCl = 3 pH of 1 M CH3COOH = 2.4 2014-08-07 21:15:23 補充： acid molecules 在水中產生 hydrogen ions，稱為 dissociation (離解) 或 ionization (電離)，而不稱為 decomposition (分解)。 CH3COOH 是弱酸，在水中 partly ionized to give hydrogen ions. CH3COOH(aq) ? CH3COO?(aq) + H?(aq) H2SO4 是強酸，現階段可當作在水中 completely ionized to give hydrogen ions. H2SO4(aq) → SO42?(aq) + 2H?(aq) 2014-08-07 21:16:23 補充： 計算弱酸水溶液的 pH，這是較高班才會學到，現階段無需學習。 2014-08-08 14:33:00 補充： 忘了回答你： hydrogen ion 的 formula 是 H?，是由一個 H 原子組成的 positive ions。 acids 會 dissociate 出 hydrogen ions。 hydroxide ion 的 formula 是 OH?，是由一個 O 原子和一個 H 原子組成的 negative ions。 alkali 會 dissociate 出 hydroxide ions。 2014-08-08 14:35:48 補充： 不懂計算，就用我回答的那段文字便可以了： "The concentration of hydrogen ions in a solution of an acid depends on not only the strength of the acid, but also the concentration of the acid. A more concentrated solution of a weaker acid may have a lower pH than a less concentrated solution of a stronger acid." 2014-08-08 14:40:35 補充： 若果真要舉例。 pH of 0.001 M HCl = -log(0.001) = 3 是你懂得計的。 pH of 1 M CH3COOH = 2.4 在網上可以查得，只需搜尋 "ph of 1 m ch3cooh" 便可。
其他解答:
First, what is pH ? 1.pH= concentration of hydrogen ions 2.concentration=mole of solute/volume An acid will ionize to form H+ when dissolved in water. Strong acid is an acid which completely dissociate(ionize) to form H+. Weak acid is an acid which only partially dissociate(ionize) to form H+. ie.some weak acid molecules do not form H+. 如果1個solution 得1滴strong acid 同一大兜水,入面H+ 既concentration會好低,咁pH都唔會好acidic 如果1個solution 有100滴weak acid係同一大兜水,雖然唔係每個acid molecule都會分出H+,但H+分出黎既總數都多過個1滴strong acid所分出黎既. 係同一volume(水)下,多d H+既數量,自然H+既concentration都會較高,所以1兜strong acid solution既pH唔一定低過weak acid solution.需要視乎(有幾多)acid,(有幾多)水,如果有相同咁多mole既acid,同樣volume既水,acid有同樣既basicity,strong acid solution的pH就會低過weak acid. 2014-08-07 17:43:13 補充： So,the statement is false
chem strengths of acids
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發問:點諗都諗唔明。。。 http://postimg.org/image/3tsd27t0z/ 更新: 不好意思啊！為甚麼CH3COOH的pH會計到2.4呢？ 更新 2: hydroxide ions and hydrogen ions. Any difference? 其實CH3COOH 和H2SO4的分解是甚麼原理呢？為何沒有O2ions在裏面喇？ 更新 3: 唔該！你很細心！中英並用的為我解釋！哈sorry我用錯了分解，應是離解。。。謝謝你的指導！但是如過現在不用學計weak acids 的pH，但我那條又想解釋返，那該怎麼辦？ 真的真的麻煩你啊！ 更新 4: 也謝謝gg的answer!你也很用心！
最佳解答:
Thestatement is incorrect. 敘述句錯誤。 The concentration of hydrogen ions in a solution of an acid depends on not onlythe strength of the acid, but also the concentration of the acid. A moreconcentrated solution of a weaker acid may have a lower pH than a lessconcentrated solution of a stronger acid. 酸溶液中的氫離子濃度不僅受酸的強度影響，還受到濃度的影響。濃度較高的較弱酸溶液的 pH 可能低於濃度較低的較強酸溶液。 For example, HCl is a strong acid, while CH3COOH is a weak acid. pH of 0.001 M HCl = 3 pH of 1 M CH3COOH = 2.4 2014-08-07 21:15:23 補充： acid molecules 在水中產生 hydrogen ions，稱為 dissociation (離解) 或 ionization (電離)，而不稱為 decomposition (分解)。 CH3COOH 是弱酸，在水中 partly ionized to give hydrogen ions. CH3COOH(aq) ? CH3COO?(aq) + H?(aq) H2SO4 是強酸，現階段可當作在水中 completely ionized to give hydrogen ions. H2SO4(aq) → SO42?(aq) + 2H?(aq) 2014-08-07 21:16:23 補充： 計算弱酸水溶液的 pH，這是較高班才會學到，現階段無需學習。 2014-08-08 14:33:00 補充： 忘了回答你： hydrogen ion 的 formula 是 H?，是由一個 H 原子組成的 positive ions。 acids 會 dissociate 出 hydrogen ions。 hydroxide ion 的 formula 是 OH?，是由一個 O 原子和一個 H 原子組成的 negative ions。 alkali 會 dissociate 出 hydroxide ions。 2014-08-08 14:35:48 補充： 不懂計算，就用我回答的那段文字便可以了： "The concentration of hydrogen ions in a solution of an acid depends on not only the strength of the acid, but also the concentration of the acid. A more concentrated solution of a weaker acid may have a lower pH than a less concentrated solution of a stronger acid." 2014-08-08 14:40:35 補充： 若果真要舉例。 pH of 0.001 M HCl = -log(0.001) = 3 是你懂得計的。 pH of 1 M CH3COOH = 2.4 在網上可以查得，只需搜尋 "ph of 1 m ch3cooh" 便可。
其他解答:
First, what is pH ? 1.pH= concentration of hydrogen ions 2.concentration=mole of solute/volume An acid will ionize to form H+ when dissolved in water. Strong acid is an acid which completely dissociate(ionize) to form H+. Weak acid is an acid which only partially dissociate(ionize) to form H+. ie.some weak acid molecules do not form H+. 如果1個solution 得1滴strong acid 同一大兜水,入面H+ 既concentration會好低,咁pH都唔會好acidic 如果1個solution 有100滴weak acid係同一大兜水,雖然唔係每個acid molecule都會分出H+,但H+分出黎既總數都多過個1滴strong acid所分出黎既. 係同一volume(水)下,多d H+既數量,自然H+既concentration都會較高,所以1兜strong acid solution既pH唔一定低過weak acid solution.需要視乎(有幾多)acid,(有幾多)水,如果有相同咁多mole既acid,同樣volume既水,acid有同樣既basicity,strong acid solution的pH就會低過weak acid. 2014-08-07 17:43:13 補充： So,the statement is false
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