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Generally, one kilogram of flour is about 10g, and only baking soda is not very effective. It is best to add baking powder, mainly baking soda, but there are other ingredients, so that the foaming effect is better. It's just that authentic hair noodles are made of old noodles or yeast.

Baking soda, that is, sodium bicarbonate, commonly known as baking soda, baking soda powder and sodium bicarbonate, is a white fine crystal, and its solubility in water is less than that of sodium carbonate. This is an industrial chemical, which may be toxic. Solids above 50℃ begin to decompose gradually to produce sodium carbonate, carbon dioxide and water, and completely decompose at 440℃. Sodium bicarbonate is an acid salt formed by neutralization of strong alkali and weak acid, which is weakly alkaline when dissolved in water. This characteristic can make it a leavening agent in food production. Sodium carbonate will remain after the action of sodium bicarbonate, and excessive use will make the finished product have an alkaline taste.