Converting % to mg/l and then dilution maths, Just can't get my head round

[The grumpy one]

I love learning but this, I just can't get my head round. Chemistry was always my weakest subject, but give me some maths and I am happy.

The concept of working out just what you are dosing your tank to in terms of mg/l or ppm.

I have tried again to understand and came up with this:

TNC complete %	1.500​	0.200​	5.000​	0.800​	0.080​	0.018​	0.002​	0.010​	0.010​	0.001​
	Nitrogen	Phosphorus	Potassium	Magnesium	Iron	Manganese	Copper	Boron	Zinc	Molybdenum
	N	P	K	Mg	Fe	Mn	Cu	B	Zn	Mo
TNC complete	mg/L or ppm	mg/L or ppm	mg/L or ppm	mg/L or ppm	mg/L or ppm	mg/L or ppm	mg/L or ppm	mg/L or ppm	mg/L or ppm	mg/L or ppm
mg/l = % x 10000	15000​	2000​	50000​	8000​	800​	180​	20​	100​	100​	10​
3ml would be ppm = mg/l / (l/dose)	45.00​	6.00​	150.00​	24.00​	2.40​	0.54​	0.06​	0.30​	0.30​	0.03​
So dilute into 30l mg/l / 30	1.500​	0.200​	5.000​	0.800​	0.080​	0.018​	0.002​	0.010​	0.010​	0.001​

Have I finally solved this?
I am sure that % and dilute into 30l being the same is just a fluke?

 

[dw1305]

Hi all,

I am sure that % and dilute into 30l being the same is just a fluke?

It is because you are entirely in the "powers of ten", so 3 ml in 30 litre volume. This one is the same relationship,10 ml in 100 litre volume.

cheers Darrel