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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 13, Number 2
JKCSEZ 13(2)
April 20, 1969 

A study on the apparent and partial molal volumes of n-Alkyl amine hydrochloride in water

n-Alkyl amine 염산염의 수용액 중에서의 apparent 및 partial molal volumes에 관한 연구
Sang Ki Yoon

n-Alkylamine hydrochlorides CnH2n+1NH3CI에서 n=0에서 n=4 까지 이르는 저분자량 동족체의 apparent molal volume Фv 및 partial molal volume V˚을 30℃수용애에서 측정하엿다 아민산의 농도는 0.01M에서 0.3M까지 , 밀도측정은 부력법(Float method)를 적용하여 소수점 이하 5위까지 취하였다. 실험결과 동족체의 분자량이 일정량 CH2식 증가함에 따라 V˚값이 규칙적인 파초서 증가한다는 사실이 관측되었다. 또한 농도증가함에 따른 Фv 변화는 공통적으로 직선적이고 limiting slope는 positive이며 비교적 이론치에 가까왔다. 공통anion인 염소이온 CI-의 partial molal volume, V˚CI-은 18.6ml mole-1으로 타연구자들의 date와 대체적으로 일치하였다. Фv 값의 변화로 보아 이온의 hydrophobic effect와 change effect는 거의 경합상태이나 charge effect 곧 electrostriction effect가 우세를 보였다.

The apparent and partial molal volumes(Φvand V°) of a series of homologous n-alkylamine hydrochlorides CnH2n+1NH3+Cl-, where n varies from zero to four, have been determined by means of a float method at 30℃ to the fifth decimal place down to 0.01M in aqueous solutions. The experimental results indicate that the partial molal volumes of the salts are almost additive for successive homologues depending on the increment of molecular weight (CH2). It has been observed that the concentration dependence of the Φv are linear in general and limiting slopes are positive and relatively close to the theoretical values. Anionic partial molal volume of chlorides anion V˚Cl- is found to be 18.6 ml mole-1, which is in good agreement with the results of other workers. Φv data also show that in solution the hydrophobic effect of ions are in competition with the charge effect, but the latter, that is, electrostriction seemed to be considerably predominant.

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