{"id":47238,"date":"2026-07-22T09:01:00","date_gmt":"2026-07-22T00:01:00","guid":{"rendered":"https:\/\/blog.agentsoft.co.kr\/index.php\/2026\/07\/22\/47238\/"},"modified":"2026-07-22T09:01:00","modified_gmt":"2026-07-22T00:01:00","slug":"a-%eb%a0%88%ed%8f%ac%ed%8a%b8-%eb%b6%84%ec%84%9d%ed%99%94%ed%95%99%ec%8b%a4%ed%97%98-7-determination-of-water-hardness-by-edta-titration","status":"publish","type":"post","link":"https:\/\/blog.agentsoft.co.kr\/index.php\/2026\/07\/22\/47238\/","title":{"rendered":"[A+ \ub808\ud3ec\ud2b8] \ubd84\uc11d\ud654\ud559\uc2e4\ud5d8 7. Determination of water hardness by EDTA titration"},"content":{"rendered":"

<\/p>\n

\ubaa9\ucc28<\/strong><\/p>\n

I.\t Title<\/p>\n

II.\t Principle & Object
\n1)\tPrinciple
\n2)\tObject<\/p>\n

III.\t Reagents <\/p>\n

IV.\tApparatus & Instruments
\n1)\tApparatus
\n2)\tInstruments<\/p>\n

V.\t Procedure
\n1)\t\uc7a5\uce58\ub3c4
\n2)\t\uae30\uae30 \uc0ac\uc6a9\ubc95<\/p>\n

VI.\t Result
\n1)\t\ubc18\uc751\uc2dd\uacfc \uacc4\uc0b0\uc2dd
\n2)\t\uad50\uc7ac\ub97c \ud1a0\ub300\ub85c \uc21c\uc11c\ub300\ub85c \uc791\uc131<\/p>\n

VII.\t Homework<\/p>\n

\ubcf8\ubb38\ub0b4\uc6a9<\/strong><\/p>\n

i. Principle & Object
\n4-1. Principle
\n\uc801\uc815\ubc18\uc751:
\nMg2++ Y4- \u21cc MgY2- (> pH 10)
\nCa2++ MgY2- \u21cc CaY2-+ Mg2+ (> pH 10)
\nMg2++ HIn2- \u21cc MgIn-+ H+
\n\uc885\ub9d0\uc810:
\nMgIn-+ Y4-+ H+ \u21cc MgY2- + HIn2-
\n red colorless colorless blue
\nIn-: Indicator, Y4-: EDTA (> pH 10)<\/p>\n

4-2. Object
\n\ubb3c\uc758 \uc138\uae30\ub294 \ubb3c\uc18d Ca2+, Mg2+ \uc774\uc628\uc758 \uc591\uc744 \uc774\uac83\uc5d0 \ub300\uc751\ud558\ub294 CaCO3\uc758 ppm\uc73c\ub85c \ud658\uc0b0\ud574 \ud45c\uc2dc\ud55c\ub2e4. Schwarzenbach\uc758 \ud0ac\ub808\uc774\ud2b8 \uc801\uc815\ubc95\uc774 \ubc1c\ud45c\ub41c \ud6c4\ubd80\ud130 EDTA\ub97c \uc774\uc6a9\ud55c \ud0ac\ub808\uc774\ud2b8 \uc801\uc815\ubc95\uc744 \ud1b5\ud574 \ubb3c\uc758 \uc138\uae30\ub97c \uce21\uc815\ud55c\ub2e4.
\n\uae08\uc18d \uc774\uc628\uc744 \ud3ec\ud568\ud55c \uc2dc\ub8cc \uc6a9\uc561\uc5d0 \uc644\ucda9 \uc6a9\uc561\uc744 \uac00\ud574 \uc77c\uc815\ud55c pH\ub85c \uc870\uc815\ud558\uace0, \uae08\uc18d \uc774\uc628 \uc9c0\uc2dc\uc57d\uacfc \ud0ac\ub808\uc774\ud2b8 \ud45c\uc900\uc6a9\uc561\uc744 \uc774\uc6a9\ud558\uc5ec \uc801\uc815\ud55c\ub2e4. EDTA\ub294 ethylenediamine tetraacetic acid\uc758 \uc57d\uc790\ub85c, \uae08\uc18d\uacfc 1:1\ub85c \ubc18\uc751\ud558\uc5ec \ucc29\ud654\ud569\ubb3c(chelate complex)\ub97c \ud615\uc131\ud55c\ub2e4. <\/p>\n

ii. Reagents
\n\u2460 HCl (36.46 g\/mol, Hydrochloric acid, \uc5fc\uc0b0, d=1.18 g\/cm\u00b3, bp=-85.05\u2103, mp=-114.22\u2103, \ud53c\ubd80\uc5d0 \ub2ff\uc9c0 \uc54a\ub3c4\ub85d \uc8fc\uc758\ud55c\ub2e4.)
\n\u2461 NaOH(40 g\/mol, Sodium hydroxide, \uc218\uc0b0\ud654\uc18c\ub4d0, d=2.13 g\/cm\u00b3, bp=1390\u2103, mp=318\u2103, \uc5f4, \uac00\uc5f0\uc131 \ubb3c\uc9c8, \ud658\uc6d0\uc131 \ubb3c\uc9c8\uacfc \uae08\uc18d\uc744 \ud53c\ud558\uace0, \ud53c\ubd80\uc5d0 \uc811\ucd09\ud558\uc9c0 \uc54a\ub3c4\ub85d \uc8fc\uc758\ud55c\ub2e4.)
\n\u2462 H2O(18.01528 g\/mol, Water, \ubb3c, d=1 g\/cm\u00b3 (4\u2103), bp=100\u00b0C, mp=0\u00b0C, \uc0c1\uc628\uc0c1\uc555\uc870\uac74\uc5d0\uc11c \uc548\uc815\ud558\uba70, \uc5f4, \uc624\uc5fc \ubc0f \ubb3c \ubc18\uc751\uc131 \ubb3c\uc9c8\uc744 \ud53c\ud574\uc57c \ud55c\ub2e4.)
\n\u2463 CaCO3(100.09 g\/mol, Calcium carbonate, \ud0c4\uc0b0\uce7c\uc298, d=2.71 g\/cm\u00b3, bp=\uc790\ub8cc \uc5c6\uc74c..<\/p>\n

<\uc911 \ub7b5><\/p>\n

\ucd9c\ucc98 : \ud574\ud53c\ucea0\ud37c\uc2a4<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

\ubaa9\ucc28 I. Title II. Principle & Object 1) Principle 2) Object III. Reagents IV. Apparatus & Instruments 1) Apparatus 2) Instruments V. Procedure 1) \uc7a5\uce58\ub3c4 2) \uae30\uae30 \uc0ac\uc6a9\ubc95 VI. Result 1) \ubc18\uc751\uc2dd\uacfc \uacc4\uc0b0\uc2dd 2) \uad50\uc7ac\ub97c \ud1a0\ub300\ub85c \uc21c\uc11c\ub300\ub85c \uc791\uc131 VII. Homework \ubcf8\ubb38\ub0b4\uc6a9 i. Principle & Object 4-1. Principle \uc801\uc815\ubc18\uc751: Mg2++ Y4- \u21cc MgY2- (> pH 10) […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[57287,57674,5017,57673,22908],"class_list":["post-47238","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-1x-trypsin-edta","tag-schwarzenbach","tag-5017","tag-57673","tag-22908"],"_links":{"self":[{"href":"https:\/\/blog.agentsoft.co.kr\/index.php\/wp-json\/wp\/v2\/posts\/47238","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.agentsoft.co.kr\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.agentsoft.co.kr\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.agentsoft.co.kr\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.agentsoft.co.kr\/index.php\/wp-json\/wp\/v2\/comments?post=47238"}],"version-history":[{"count":0,"href":"https:\/\/blog.agentsoft.co.kr\/index.php\/wp-json\/wp\/v2\/posts\/47238\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.agentsoft.co.kr\/index.php\/wp-json\/wp\/v2\/media?parent=47238"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.agentsoft.co.kr\/index.php\/wp-json\/wp\/v2\/categories?post=47238"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.agentsoft.co.kr\/index.php\/wp-json\/wp\/v2\/tags?post=47238"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}