How to calculate the Percentage of moisture loss

Question

Hello,

i know this might be simple, but i need help so i know how to do it going forward. I did an experiment and here are my data. The sample is a dry ingredient.

Weigh of tray= 6.40g

weigh of sample= 2.31 g

Sample was heated and cooled.

Sample weigh after heating= 8.35 g

important to note = the sample weight after heating is with the tray

How do I calculate the moisture loss %

Answer 1

I've read the original question and the comments, so let me see if I understand the problem.

Sample (original mass) = 2.31 g

Tray = 6.40 g

Sample + tray after heating = 8.35 g

Thus, the mass of the sample AFTER heating = 8.35 g - 6.40 g = 1.95 g (do you see how that is done?)

So, how much moisture was lost during the heating? It would be 2.31 g - 1.95 g = 0.36 g of moisture

% moisture = 0.36 g / 2.31 g (x100%) = 15.5%

Answer 2

Hi Nicki K

First thanks so much for responding

The total weight before drying represents the sample before any volatile material was driven off by heating, it should be larger than the dry weight which represents the sample after the temperature sensitive material was removed during heating.

(weight before drying - dry weight)*100/sample weight

(8.71 - 8.35)*100/2.31

Can you continue from here?

By the way, the tray weight is common to both before and after drying, let me know if you have any questions.