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Remote Ready Biology Learning Activities has 50 remote-ready activities, which work for either your classroom or remote teaching.
Sodium bicarbonate solution
For a 0.3% solution of sodium bicarbonate, you would add 0.9 grams of sodium bicarbonate to 300 mL of water. For a 0.5% solution of sodium bicarbonate, you would add 1.5 grams of sodium bicarbonate to 300 mL of water. For a 0.2% solution of sodium bicarbonate, you would add 0.6 grams of sodium bicarbonate to 300 mL of water. (See http://www.physiologyweb.com/calculators/percent_solutions_calculator.html.)