It is somewhat surprising to me that there is almost no data about solubility of potassium silicate in water under normal conditions. The only thing I was able to find is the following:
<0.336 g/L @ 25ΕC, increasing to 300 g/L @ 80ΕC. Once dissolved, material will not precipitate out
However, it is not clear what does the last statement mean. Does it mean that the silicate will not precipitate even if the solution cools down to
The solubility of sodium silicate can easily be found on Wikipedia. It is mystery in case of potassium silicate.
So let us assume we want to dissovle potassium silicate in water with initial pH of 7. What amount of potassium silicate can be dissolved?
Regarding the comment of
@M. Farooq about being more specific. The second sentence on Wikipedia says:
The most common potassium silicate has the formula K2SiO3, samples of which contain varying amounts of water.
We can consider the anhydrous form of
K2SiO3 and couple of most common hydrates. Also, if the exact amount is not known then at least knowing the order of magnitude is fine as there is huge difference between