How much does saturated kalkwasser weigh?

[nim6us]

I’m recalibrating my kalk continuous doser and essentially the pump runs for a fixed amount of time, afterwards you enter the amount of liquid dispensed in milliliters.

I never trust my eyes to read levels of graduation on a tube anymore I calculate by weight instead. I know for example 1ml of water weighs 1g. So I’d like to know how much 1ml of saturated kalkwasser weighs.

Google has failed me and I’m hoping someone here has done the math before.

 

[KrisReef]

Are you using RODI or saltwater for your solute? That weight/ml + dissolution weight/kalkwasser in that solute is the formula, but you need to provide the chemists with the solute you will use for them to provide an answer from tables if there are tables for this kind of thing?

Also the SPG of your saltwater to limit other assumptions, (Temperature, pressure (sea level?) etc.

 

[Randy Holmes-Farley Verified Community Expert]

I’m recalibrating my kalk continuous doser and essentially the pump runs for a fixed amount of time, afterwards you enter the amount of liquid dispensed in milliliters.

I never trust my eyes to read levels of graduation on a tube anymore I calculate by weight instead. I know for example 1ml of water weighs 1g. So I’d like to know how much 1ml of saturated kalkwasser weighs.

Google has failed me and I’m hoping someone here has done the math before.

Water is not exactly 1 g/ml, but within that level of precision, so is kalkwasser.

 

[KrisReef]

Water is not exactly 1 g/ml, but within that level of precision, so is kalkwasser.

So the OP needs to purchase an crazy electronic balance to use mass, how about a colorimeter? Is there an option, or some other way, or does it matter?

 

[nim6us]

HaHaha! So clearly I’m looking too deeply into this, using 1ml equals 1g will get me as close as I need for calibrating a doser.

 

[KrisReef]

HaHaha! So clearly I’m looking to deeply into this, using 1ml equals 1g will get me as close as I need for calibrating a doser.

These questions are great for exercising my feeble old thinking organ. Getting the right/best answer is helpful to many many many of us, and many more too!

 

[Randy Holmes-Farley Verified Community Expert]

Right. For doser calibration, use 1 mL per g. If you really want to measure the potency of the kalkwasser based in density, you’d need a very precise volume and mass measurement. Volume is typically the harder one.

 

[nim6us]

Thanks! And I do love the answers.

I think of course it’s good to have the best possible information but there’s a tipping point between time/money/effort vs the results you see from the investment.

This sub forum in particular is great for understanding the practical knowledge you need and if “the juice is worth the squeeze” to really go down the rabbit hole on an issue.

 

[nereefpat]

One way to think about it; a gallon of water only holds about 2 teaspoons of lime, so maybe 5-10 grams.

 

[nim6us]

Ahh of course! That's such an obvious way I could have done the math. I add 1.6g of kalk powder per 1L of water. And if we say 1L or 1,000ml of RO water weighs roughly 1,000g that would mean, ballpark, 1ml of saturated kalk solution would be 1.0016g.

I can see now why the guys were saying just go 1ml equals one 1g.

 

[taricha]

If this is remotely accurate, it actually looks like the density of saturated kalk is so close to water that it's a surprisingly terrible measure...(0.9991 at 25C)
From "Calcium hydroxide as a highly alkaline pH standard"

 

[Randy Holmes-Farley Verified Community Expert]

In general, the density of a water solution that contains salts is not just the sum of the total mass in the same volume because the liquid volume changes when adding salts to water. It usually increases, but by less than one expects by simple combination because salts cause the water to “contract” by being tightly bound to the ions.