1 liter of water weighs 1 kg so 1 ml of water weighs 1 mg so 5 ml of water weighs 5 mg
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mL usually doesn't represent weight. But, mL meansmilliliters, so the 500 mL flask would be 500 milliliters.
At 4 degrees C, 175 ml of pure water would have mass of 175 g.
None. A pound is a measure of weight whereas a ml is a measure of volume. The weight of 4500ml depends on the density of the substance.
Only if it is water, which has a mass of 1gram per ml volume
A 50 ml solution that is 10% acid will consist of 5 ml of acid (10% of the volume) and 45 ml of water (90% of the volume). You're not adding any water, but you want to add enough acid to make a solution that is 50% acid and 50% water. You will need to have a total of 45 ml of acid in the mixture to make it a 50/50 solution, since the amount of water is also 45 ml. You have 5 ml in there already, so you would need to add 40 ml of acid. That would make a total 90 ml solution that is 50% water (45 ml) and 50% acid (45 ml).