Heartbroken but hope she will fix

Does anyone know if I can use 100% calcium carbonate for calcium deficiency,

Ain't got nothing else and I'm getting brown spots on the 2 autos, the ww isn't far away from being done and has yellowing leaves but I damaged it the other day and I think it might be to do with that, but the lemonberry is wilting abit along with brown spots on leaves and the buds don't look right to me as is its stunted.
 
not sure , is it just like baking powder id go light to see

Calcium carbonate, the chief component of limestone, is a widely used amendment to neutralize soil acidity and to supply calcium (Ca) for plant nutrition
not sure , is it just like baking powder id go light to see

Calcium carbonate, the chief component of limestone, is a widely used amendment to neutralize soil acidity and to supply calcium (Ca) for plant nutrition
made up a mix of 1 teaspoon of Epson salts and a quarter teaspoon of calcium carbonate in 3 litres of water, only used a bit on the lemonberry to see what happens,,,

The thing is calcium carbonate is insoluble in water, will the plant obsorb the calcium?

Here's pics of the problem I have, any suggestions welcome
 

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