Question

A formulation is to be adjusted to a moisture content of 15% on a dry basis. If it is found to contain 11.4% of water initially, how much water must be added per 100 kg of formulation, to produce the desired moisture content? I need a diagram to help me understand the question, thx

Answer 1

Fig explained:- the formulation is kept in a container having initial moisture of 11.4%. Then, calculated quantitiy of water added to the mixture and finally wet formulation is obtained.

As the formulation is already having a water content of 11.4 % , so the dry basis will be

100kg -11.4 kg = 88.6 kg , Now the formulation is adjusted to a 15% moisture content

therefore, 15% is 1.15 , so, 88.6 * 1.15 = 101.89 kg

So, you need to add 1.89 kg of water to the 100 kg of the formulation to produce the desired moisture content.

(Above solution is in the consideration to the dry basis formulation , if that is not the case student is advised to simply calculate on the basis of 100 kg without eliminating the already present moisture (11.4 %) )