It is very dependant on the size of your cabbage and the amount of nutrients in your soil
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You can show how chemists use indicators to determine if a substance is acid or base. You make the indicator by chopping up some red cabbage and soaking it in water.* The water will turn blue from the color in the cabbage. This water is your "indicator". Pour it off in one or more glasses and add various substances to see the color change. Acids will make the water red and bases (alkalies) will make the water blue again. Try vinegar (acedic acid) - a small amount will do. Try baking soda (sodium bicarbonate). *The indicator water will be much brighter colored if you heat the cabbage in the water for a minute or two.
It depends on how much water is in the air to start with and how big the dehumidifier is. Air temperature is also a major factor, cold air can't hold much water whereas warm air can. All a dehumidifier does is drop the air temperature below its dew point making it give up some of the water it holds.
for a brick to float on water 2 thirds of the mixture should be salt
If you want to use the whole 181.4 grams, then you need to calculate how much water to use. 400 mg is 0.4 of a gram, so the weight ratio is 181.4/0.4 = 453.5, so that is the number of gallons of water you should use
The amount of water.