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polymer ÃàÁßÇսà ¿¾ÈÁ¤Á¦ÀÇ ¸ÞÄ«´ÏÁò¿¡ ´ëÇØ ¾Ë°í½Í½À´Ï´Ù.
Stefano
Stefano
00-00-00 00:00
(1) ¼Ò¼®È¸ ´Ü°¡°¡ 20%°æ¿ì°¡ 30%º¸´Ù ºñ½Î´Ù´Â °ÍÀÌ ÀÌÇØ°¡ µÇÁö ¾Ê½À´Ï´Ù. Ç°ÁúÀÌ ´Ù¸¥ ¸ð¾çÀÌÁö¿ä?
(2) Ca(OH)2¸¦ »ç¿ëÇÏ¿© ¾òÀ» ¼ö ÀÖ´Â pH´Â ´ÙÀ½°ú °°ÀÌ °è»êµË´Ï´Ù.
Ca(OH) -->{Ca(OH)}+ + OH- K1=3.74E-3
[Ca(OH)+][OH]/[Ca(OH)2]= x^2/(Co-x)= 3.74E-3
¿©±â¼ [ ]´Â ¸ô³óµµ(g-mol/L), x´Â Çظ®µÈ ¼Ò¼®È¸ ³óµµ(g-mol/L)
Co = Ãʱ⠼Ҽ®È¸ ³óµµ, g-mol/L
(3)À§ÀÇ ½ÄÀ» ÀÌ¿ëÇؼ OH³óµµ¸¦ °è»êÇϸé..
20%ÀÇ °æ¿ì Co = 200/74.08 = 2.70 .....(ºñÁß=1.0 À̶ó°í°¡Á¤½Ã)
==>...x = 0.09864 = [OH-] pOH = -log[OH-] = 1.00595
==>pH= 14-pOH =12.994
30%ÀÇ °æ¿ì Co = 300/74.08 = 4.0497....(ºñÁß=1.0 À̶ó°í°¡Á¤½Ã)
==>...x = 0.1213= [OH-] pOH = -log[OH-] = 0.9164
==>pH=14-pOH = 13.0835
µÎ°æ¿ì ¸ðµÎ pH=13 Á¤µµ°¡ µË´Ï´Ù.
(4) pH MeterÀÎ °æ¿ì °»ê¿Í °¾ËÄ«¸® ¿µ¿ª¿¡¼ ¿ÀÂ÷°¡ Å®´Ï´Ù.
Âü°íÇϱ⠹ٶø´Ï´Ù. pH °è±âÀÇ Sensor Ư¼º ¶§¹®¿¡ ±×·¸´Ù°í ¾Ë·ÁÁ® ÀÖ½À´Ï´Ù. ±× ÀÌÀ¯´Â Vendor³ª Àü±âÈÇÐ Àü¹®°¡¿¡°Ô ¹®ÀÇÇØ ºÁ¾ß ÇÒ °Í °°½À´Ï´Ù.
Stefano/021217
(1) ¼Ò¼®È¸ ´Ü°¡°¡ 20%°æ¿ì°¡ 30%º¸´Ù ºñ½Î´Ù´Â °ÍÀÌ ÀÌÇØ°¡ µÇÁö ¾Ê½À´Ï´Ù. Ç°ÁúÀÌ ´Ù¸¥ ¸ð¾çÀÌÁö¿ä? (2) Ca(OH)2¸¦ »ç¿ëÇÏ¿© ¾òÀ» ¼ö ÀÖ´Â pH´Â ´ÙÀ½°ú °°ÀÌ °è»êµË´Ï´Ù. Ca(OH) -->{Ca(OH)}+ + OH- K1=3.74E-3 [Ca(OH)+][OH]/[Ca(OH)2]= x^2/(Co-x)= 3.74E-3 ¿©±â¼ [ ]´Â ¸ô³óµµ(g-mol/L), x´Â Çظ®µÈ ¼Ò¼®È¸ ³óµµ(g-mol/L) Co = Ãʱ⠼Ҽ®È¸ ³óµµ, g-mol/L (3)À§ÀÇ ½ÄÀ» ÀÌ¿ëÇؼ OH³óµµ¸¦ °è»êÇϸé.. 20%ÀÇ °æ¿ì Co = 200/74.08 = 2.70 .....(ºñÁß=1.0 À̶ó°í°¡Á¤½Ã) ==>...x = 0.09864 = [OH-] pOH = -log[OH-] = 1.00595 ==>pH= 14-pOH =12.994 30%ÀÇ °æ¿ì Co = 300/74.08 = 4.0497....(ºñÁß=1.0 À̶ó°í°¡Á¤½Ã) ==>...x = 0.1213= [OH-] pOH = -log[OH-] = 0.9164 ==>pH=14-pOH = 13.0835 µÎ°æ¿ì ¸ðµÎ pH=13 Á¤µµ°¡ µË´Ï´Ù. (4) pH MeterÀÎ °æ¿ì °»ê¿Í °¾ËÄ«¸® ¿µ¿ª¿¡¼ ¿ÀÂ÷°¡ Å®´Ï´Ù. Âü°íÇϱ⠹ٶø´Ï´Ù. pH °è±âÀÇ Sensor Ư¼º ¶§¹®¿¡ ±×·¸´Ù°í ¾Ë·ÁÁ® ÀÖ½À´Ï´Ù. ±× ÀÌÀ¯´Â Vendor³ª Àü±âÈÇÐ Àü¹®°¡¿¡°Ô ¹®ÀÇÇØ ºÁ¾ß ÇÒ °Í °°½À´Ï´Ù. Stefano/021217
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Stefano
Stefano
39-08-02 00:00
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