Spectrophotometric Determination of a Food Dye

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  • เผยแพร่เมื่อ 14 ธ.ค. 2024

ความคิดเห็น • 7

  • @Zero_Cruz34
    @Zero_Cruz34 9 หลายเดือนก่อน +1

    This was such a wonderful and instructional video, great job and thank you!

  • @RMalai
    @RMalai 2 ปีที่แล้ว +2

    Thank you. I ask my students to watch this before their lab.

  • @poojagirish9663
    @poojagirish9663 2 ปีที่แล้ว

    how did u make the stock solution?

    • @acebelka2186
      @acebelka2186 2 ปีที่แล้ว +4

      Take stock Allura red SOLIDS (~496g/mol in molar mass) and calculate the volume of the container you want to use for your own stock solution; the container they have has a mol/L count(M) of 9.476*10^(-4)M.
      For their case, if this was a 1L container, we would take that number in mol/L and multiply it by the 496 grams, divide by 1 mol and multiply by 1L which gets 0.4700096 grams. Therefore, for 9.476*10^(-4)M in a *1 liter* container, you need ~0.47 grams of Allura red solids; mix it all the way up with water and you get the same stock solution as them.
      Your institution may require or even give a different stock solution (M), so keep that in mind.
      Also keep in mind if you use a different volume, you will have to multiply by different amounts (e.g, 50mL would have to multiply 0.05L in the prior equation).
      Good luck and good chemistry. 👍

  • @melissanormoyle
    @melissanormoyle 4 ปีที่แล้ว +1

    is it okay to touch the bottom of the beaker with the glass pipette when picking up stock dye? Will this cause air bubbles?

    • @DrRichardMusgrave
      @DrRichardMusgrave  4 ปีที่แล้ว +4

      It's ok, provided you keep the pipette at an angle to the bottom of the beaker.

    • @melissanormoyle
      @melissanormoyle 4 ปีที่แล้ว +1

      @@DrRichardMusgrave Thank you!