I only use 1/4 of a teaspoon of baking soda when I take it for heartburn. I don't take any more, I may be wrong, but I think it could make your body TOO alkaline. As far as the vitamin C, I think the powder from capsules that equals 3,000mg would be a good amount for your purpose. It it were me, I'd repeat the vitamin C every 3-4 hours after the initial dose, without the baking soda.
"We can judge the heart of a man by his treatment of animals." ~Immanual Kant~