산-염기의 g당량수. equivalent weight
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▶ g당량수 = 몰질량 / 당량수
( 관련 글 http://ywpop.tistory.com/5945 )
The gram equivalent weight (sometimes called simply the "equivalent weight") of an acid is the weight in grams that will provide one mole (6.022×10^23) of H^+ ions.
The gram equivalent weight of a base is the weight in grams that will provide one mole (6.022×10^23) of OH^- ions.
ex) potassium hydroxide (KOH) has a formula weight = 56.11. Since 1 mole of KOH represents 1 mole of OH^-, the gram equivalent weight of KOH is 56.11.
KOH의 g당량수 = 56.11 g/eq
KOH의 당량수 = 1 eq/mol
ex) hydrochloric acid (HCl) has a formula weight = 36.46. 1 mole of HCl represents 1 mole of H^+, so the gram equivalent weight of HCl is 36.46.
HCl의 g당량수 = 36.46 g/eq
HCl의 당량수 = 1 eq/mol
ex) sodium phosphate (NaH2PO4) has a formula weight = 119.98. Since 1 mole of NaH2PO4 represents 2 moles of H^+, the gram equivalent weight of NaH2PO4 is 119.98 / 2 = 59.99.
NaH2PO4의 g당량수 = 59.99 g/eq
NaH2PO4의 당량수 = 2 eq/mol
ex) magnesium hydroxide (Mg(OH)2) has a formula weight = 58.32. Since 1 mole of Mg(OH)2 represents 2 moles of OH^-, the gram equivalent weight of Mg(OH)2 is 58.32 / 2 = 29.16.
Mg(OH)2의 g당량수 = 29.16 g/eq
Mg(OH)2의 당량수 = 2 eq/mol
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