(((((((((( This will be our 1st stock solution: (mAcronutrients) ?
If I have to desolve above four chemicals in a seperate One Litre Of Water in a seperate plastic bottle? Four plastic bottles to desolve each chemical in a seperate bottle....?
If terminology "STOCK SOLUTION" means that I have to prepare above Stock/Reserved solution at one instance to use it in fruture applications time to time or as needed by vegetable plants?
How should I prepare my solution if I propose / want to prepare it for
1: R-DWC Bucket System (8 US Gallons X 10 buckets with 20 Litres reservior). Total: 325 Liters of plain water in 10 buckets & a reservior.
2: Plastic Bottle DWC system. (for each seperate 1.5 Litres plastic bottle. ))))))))))

5. Trace elements (make up to 1 L)
H3BO3 2.8 g
MnCl2.4H2O 1.8 g
ZnSO4.7H2O 0.2 g
CuSO4.5H2O 0.1 g
NaMoO4 0.025 g

(((((((((( This will be our 2nd stock solution: (mIcronutrients) ?
If I have to mix up above five chemicals in a One Litre Water in a single Plastic Bottle for preservation as an "2nd Stock Solution or mIcronutrients" to use it in fruture applications time to time by mixing it in "1st Solution" for each time just before use. Plz Elaborate.))))))))))

6. FeEDTA -
10.4 g EDTA.2Na
7.8 g FeSO4.7H2O
56.1 g KOH
Make up 1 L of KOH, adjust pH to ~5.5 using H2SO4. Then add EDTA.2Na and FeSO4.7H2O.

(((((((((( This will be our 3rd stock solution: (FeEDTA.) ?
If above all three solutions will be called "Stock Solutions"? ))))))))))

To make 1 L Hoagland's solution from these stocks, add
7 ml Ca(NO3)2 stock
5 ml KNO3
2 ml KH2PO4
2 ml MgSO4
1 ml Trace elements
1 ml FeEDTA
to 1 L water.

Looking forward for a help.
Prior thanks
Azee.