In place of cream of tartar to stabilize egg whites?
Your acid will work in place of potassium bitartrate, AKA cream of tartar.
Lemon juice, vinegar, or even baking powder will also work.
Six good substitutes: https://www.healthline.com/nutrition/cream-of-tartar-substitutes
Most common baking powders are a mix of sodium bicarbonate and cream of tartar. As per link, add 1.5 tsp baking powder in place of 1 tsp cream of tartar.