Sirvastava, Satish Chandra

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^ e ite ti to tke £dito tThe B oard  o f E d ito rs  m i l  not hold itse lf  responsible fo r  opin ion s expressed in  the letters published in  th is section. The notes contavm ng reports o f new work comm unicated fo r  this section should not contain m any figures and should not exceed 600 words in  length. The contri- butionis m ust reach the A ssista n t E d itor not later than the 16th of the second month preceding that of the issu e in  which the ^9]ter is  to appear. N o  p ro o f m i l  be sent to the authors.11RELATIONSHIP BETWEEN ULTRASONIC VELOCITY AND OTHER PHYSICAL PROPERTIES OF PURE ORGANIC LIQUIDSSATISH CHANDRA SRTVASTAVADidpabtment op Physical Chemtstry, Indian  Association pob the Cultivation oi' Science, Calcutta-32 {Eeceivedf Septem ber 30, 1959)While mveetigatiug the possibility of finding out a relation between ultrasoni velooity(V) and concentration of solutions, specially solutions of electrolytes, the author found a relation between V  and the internal pressure P as :Vp  ^ =  kR^P ( 1)Avhere p  is the density of the liquid and R  is molar refraction. K  is a constant equal to (7 ±  1) ■ Internal pressure may be related with boiling point of the liquidsP =  {-14004-24.5T)4.6/F„ (2)where V  is molar volume and T  is the boiling point of the liquid in degrees absolute. The relation has been verified for 75 liquids (from the data of Parthasarthy given by Vigoreaus (1952) and of Natta (1949) and has been found to be true for as many as 60 liquids. In the remaining 15 liquids 8 are alcohols, 2 acetone, and the rest water, etc. for which there is a deviation probably because of high association or polaritA better relation is observed when data are compared in the similar class of liquids. For a few of them average ratio of Vp^jR ^P  has been shown in Table I which may also be termed as constant of linearity between Vp^ and R ^P .  The range of variation has also been shown in each case,503504 Lettere to the EditorEquation (1) may alsq be kept with the help of equation (2) aswhere ki and are conetantsand will automatically hold good, if (1 ) is true.TABLE IClass of Liquids H No, of LiquidsMean slope (average ratioV,P*IR^P)Range of variation of mean slopeMono Olefins R 7.62 -I-.26, - . 2 0Parafilns 12 7.63 -I-.19, - . 0 9Alkyl Chlorides 4 7.56 +  .32, - . 19Aliphatic Esters 0 7.86 H-.41, - .3 0Alkyl Bromides* 3 7.11 +  .08, - . 0 7The equation may he helpful in deriving an equation for the velocity of ultra­sonic waves in solutions. #The author owes his sincere thanks to Prof. S. R. Palit for his valued sugges­tions and keen interest in the problem.B E P E R E N C E SVigoroauB, P., 1062, UltTasonics, Chapman and Hall,Natta, G. and Baccareddo., M., 1049, Jp^ e Makromole Chemie, 14, 134.* Bromoform has abnormally low ratio of Vp^fE^ P and therefore has not been included.Six alcohols were also tested and have tho mean ratio Vp^ /^E^  P ns fl-06 with a wid > variation as +1.10, —.70 which is beyond the desired value.

Relationship Between Ultrasonic Velocity and Other Physical Properties of Pure Organic Liquids

http://arxiv.iacs.res.in:8080/jspui/bitstream/10821/2232/1/Relationship%20Between%20Ultrasonic%20Velocity.pdf

Relationship Between Ultrasonic Velocity and Other Physical Properties of Pure Organic Liquids

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