What is the ph of a solution of base with a 0.051 m concentration of hydroxide ions

A48 g piece of ice at 0.0 ∘c is added to a sample of water at 7.4 ∘c. all of the ice melts and the temperature of the water decreases to 0.0 ∘c. how many grams of water were in the sample?

In the reaction between a crushed antacid tablet and vinegar what gas is emitted

In the space, show a correct numerical setup for calculating the number of moles of co2 present in 11 grams of co2