Hanna 1ml is not really 1ml?

[Notsolostfish]

It says add 1ml or reagant for calcium. I have a kitchen scale. I zerod it out add it 1ml. And its still 0. It didnt even touch the 1ml. Hows that test accurate? And how can we trust it with results for calcium?

 

[Dan_P]

It says add 1ml or reagant for calcium. I have a kitchen scale. I zerod it out add it 1ml. And its still 0. It didnt even touch the 1ml. Hows that test accurate? And how can we trust it with results for calcium?

Your scale malfunctioned, your scale is less sensitive than 1 g or you added 1 mL of air.

 

[BanZI29]

1ml is not a weight, it's a liquid volume measurement. depending on the liquid your using, it can have a different density and therefore weigh more or less than another liquid. you need to use a syringe to measure liquid volume
Also, that scale may not be as sensitive as you want. try it again and zero it with the bottle on.

 

[HudsonReefer2.0]

Your scale malfunctioned, your scale is less sensitive than 1 g or you added 1 mL of air.

I ml of air. Lol.

 

[HudsonReefer2.0]

Did u keep adding to the drop til it registered a gram?

 

[Notsolostfish]

I ml of air. Lol.

What do you mean 1ml of air? Doesnt make sense

 

[HudsonReefer2.0]

What do you mean 1ml of air? Doesnt make sense

Gm Was a reference to earlier post. Read up my dude

 

[PotatoPig]

The problem is the scale isn’t precise enough.

If you’re using a scale to measure about 1gram (assuming the solute is water) it needs a precision of at least 0.1g, even then you have an inherent minimum +/-5% error. Ideally the precision would go to 0.01g or better for measuring such a small weight.

 

[Sisterlimonpot]

Are you using a scale that can measure minute changes? The scale I use for most things can register 100th of a gram.

 

[Gtinnel]

A kitchen scale is not going to be accurate enough to read 1ml. Also, as already mentioned a ml is a measurement of volume not weight, so your scale is assuming a volume based upon the density of a specific liquid (I would assume water).
When measuring weight the last digit is never accurate anyway. As an example your scale says 0ml so if you trust it then you have not added anything to the vial.

ETA

 

[Mhamilton0911]

#1, The kitchen scale simply isn't sensitive enough to register such a small amount,
And #2, ml is a volume measurement, not a weight. So although a more sensitive scale will show you the weight of 1ml of liquid, that's not how to measure out a volume of liquid. Use a dosing syringe from a farm store or a medical grade one.

 

[KrisReef]

Definition 1ml (pure water) = 1gram

Hanna Calcium uses 1ml of seawater which should weight a fraction more than pure water.

 

[The_Paradox]

Definition 1ml (pure water) = 1gram

Hanna Calcium uses 1ml of seawater which should weight a fraction more than pure water.

.025g more even. Don’t ask me to convert that to millimeters though.

 

[exnisstech]

What not just use a 1ml syringe like the ones included in many of our test kits

 

[dadnjesse]

1 mm should be 1 gram if you added a full syringe it has to weigh something.

 

[The_Paradox]

1 mm should be 1 gram if you added a full syringe it has to weigh something.

Im 1780 grams tall!

 

[BanZI29]

So not to get all high school science teacher on ya but, all liquids will have different densities depending on what it is or is in it. this is why you should not weigh out liquids, especislly for water tests. Always measure in liquid volume.

 

[dadnjesse]

Im 1780 grams tall!

Great

 

[Rp8]

Love it!!!

 

[KrisReef]

.025g more even. Don’t ask me to convert that to millimeters though.

It’s a difficult conversion but the correct answer is almost always 1. (Unless you’re using heavy water instead of RODI.). Then relativity takes hold and physics calculations must be performed to take into account particle deterioration rates, not to mention evaporation at STP. According to Einstein it’s really easy but I blindly trust Hanna and pray that my syringe is properly calibrated.