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Best answer by ValeryOchkov

40 ml athanol + 60 ml water is not equal 100 ml vodka

But here we have not only a function of density

It is (see bellow) one compliment from me to Harvey

Виктор Иванович, третьим будете! Или Вернера приглашать?

vodka.png

4 replies

V
ViktorKorobov1-Visitor
1-Visitor
March 23, 2013

"Defect volume" is reduced if more accurate values for the density to use.

Vol_defect.GIF

Viktor

H
HarveyHensley12-Amethyst
12-Amethyst
March 23, 2013

It appears to be correct. The solution density is not linear (i.e. non-ideal) so the volumes don't add. I made some changes to the program because for some unknown reason the symbolic solution for mass and omeaga would not solve. However, I got your answer.

    W
    Werner_E25-Diamond I
    25-Diamond I
    March 23, 2013

    because for some unknown reason the symbolic solution for mass and omeaga would not solve.

    This is because (on contrary to the solve function in a solve block) the symbolic returns a 1x2 matrix and not a 2x1 matrix. So you would have to change the LHS accordingly. Its an exception, too, that Mathcad will tolerate different units in a matrix here.

    H
    HarveyHensley12-Amethyst
    12-Amethyst
    March 23, 2013

    Werner Exinger wrote:

    because for some unknown reason the symbolic solution for mass and omeaga would not solve.

    This is because (on contrary to the solve function in a solve block) the symbolic returns a 1x2 matrix and not a 2x1 matrix. So you would have to change the LHS accordingly. Its an exception, too, that Mathcad will tolerate different units in a matrix here.

    What you saw was my attempt to fix that problem. Valery originally had it the way you say. It still won't work as shown in the attached. It's weird because the answers are shown to the right of the symbolic arrow, but they can't be used below.

    V
    24-Ruby IV
    ValeryOchkov24-Ruby IVAuthor
    24-Ruby IV
    March 24, 2013

    Thanks to all!

    I think The solution density is a function of a concentration (linear or not linear) so the volumes don't add.

    To be or not to be - linear or not linear too

    See http://twtmas.mpei.ac.ru/mas/Worksheets/C_NaCl.mcd

    And the second.

    It will be good to create a function of density with universal argument - a titre (mg/mL), mass ratio, molarity or molality. Mathcad must itself feel what an argument is. It is possible do only in Prime not in old good Mathcad. Or?

    V
    24-Ruby IV
    ValeryOchkov24-Ruby IVAuthorAnswer
    24-Ruby IV
    March 24, 2013

    40 ml athanol + 60 ml water is not equal 100 ml vodka

    But here we have not only a function of density

    It is (see bellow) one compliment from me to Harvey

    Виктор Иванович, третьим будете! Или Вернера приглашать?

    vodka.png

    V
    ViktorKorobov1-Visitor
    1-Visitor
    March 24, 2013

    Valery Ochkov wrote:

    Виктор Иванович, третьим будете! Или Вернера приглашать?

    vodka.png

    Всегда готов!

    vodka-s-buterbrodami-s-krasnoi-i-chernoi-ikroi-0001518336-preview.jpg

    V
    24-Ruby IV
    ValeryOchkov24-Ruby IVAuthor
    24-Ruby IV
    April 1, 2013

    Solution of Solutions with Mathcad Prime 3.0 user template:

    4-1-NaCl-Solutions-Prime-eng.png

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