why does this say 20 percent iron? is it still 100% FeSO4?

The molar mass of the compound (ferrous sulfate hepthydrate) is about 278 g/mol. The molar mass of iron is about 56. 56/278 = 20% iron and 80% everything else.

Is this the same ingredients as copperas

Ignore the other guy. Copperas = Iron sulfate

Is this product good for acidifying soil for blueberries?

There are better products. Some iron (within reason) helps green up most plants, but the ferrous iron is a reductant, more like a weak base (sorta) than an acid. To acidify, use (dilute!) sulfuric or phosphoric acid, mono- or dibasic potassium phosphate, or elemental sulfur.

will this product control moss in a flower garden without significantly affecting the PH of the soil?

no. this will lower the pH slightly. also i think you are referring to algae, which grows as a result of compaction and too much water.

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Ferrous Sulfate Heptahydrate - FeSO4*7H2O - 20% Iron - Very Soluble - 1 Pound

Product ID: 5603533

Details

Brand
Alpha
Item Form
Powder
Item Volume
1 liters
Package Information
Bottle
Percentage assay
20

🐟Feed grade, safe for animal supplements

💧Highly soluble for rapid action

🔬20% pure iron content

19983CFA

Duties & taxes included

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💥 Unlock the power of pure iron – fast, effective, and feed-grade safe!

TRUSTED QUALITY - Alpha Chemicals brand with 4.5-star rating from 600+ users.
OPTIMAL IRON BOOST - Delivers a potent 20% iron concentration for maximum effectiveness.
COMPACT CONVENIENT - 1-pound bottle designed for easy storage and precise dosing.
VERSATILE APPLICATIONS - Perfect for water treatment, pest control, and animal feed supplements.
RAPID DISSOLUTION POWER - Ultra-soluble heptahydrate form ensures fast and efficient mixing.

Ferrous Sulfate Heptahydrate (FeSO4*7H2O) is a highly soluble, feed-grade iron supplement containing 20% iron. Ideal for water treatment, pest control, and animal feed, this 1-pound powder from Alpha Chemicals offers rapid dissolution and trusted quality, making it a top choice for professionals seeking reliable iron supplementation.

Specifications

% Assay of Chemical(s)	20
ASIN	B007ODUI76
Best Sellers Rank	#19,550 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #463 in Garden Fertilizers
Brand	Alpha Chemicals
Brand Name	Alpha Chemicals
Container Type	Bottle
Customer Reviews	4.5 out of 5 stars 664 Reviews
Item Form	Powder
Item Volume	1 liters
Item Weight	1.1 pounds
Manufacturer	Alpha Chemicals
Model Number	1FeSO4
Package Information	Bottle
Part Number	1FeSO4
Percentage assay	20
UPC	725410979370
Unit Count	16 Fluid Ounces
Volume	1 liters

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