Baking soda does not contain gluten.
All baking soda is gluten free, gluten is only found in flour.
I checked with a baking soda vendor and they explained that all baking soda is naturally gluten free. It is baking powder (which uses baking soda) that may contain gluten. You need to check with the manufacturer.
No, baking soda does not have gluten.
I am not sure if all baking powders are gluten free but there are gluten free baking powders. In my shop we make gluten free products and we use Clabber Girl.
You can use any or all of these in cake baking. You cannot necessarily use them interchangeably and expect identical results. It is quite usual to use both baking soda and baking powder in the same cake, especially if the recipe calls for an acid ingredient like fruit which will activate the baking soda, but in this case the volume of baking powder has usually been reduced. Baking powder mixes usually contain a small proportion of baking soda anyway. Xanthan gum is most commonly used in making gluten-free products. Gluten is the protein found in flour. Heat, as in baking, toughens protein. Raising agents like baking soda and baking powder give off little bubbles of carbon dioxide during the baking process and these bubbles are held in place by the toughening gluten, rather like little balloons being blown up - this is what causes a cake to rise and hold its shape. Xanthan gum is used in a similar way to add thickness and volume to gluten-free products. If you are wanting to add these raising agents to make a gluten-free product then read the label on the baking powder - it often contains gluten.
Not all are only if you make it gluten free.
No
Yes :)
No, Arm and Hammer baking soda is aluminum free!All baking soda is only sodium bicarbonate.
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Try Rumford or Clabber Girl brands of baking powder.
Gluten is a thickener and binding agent in baking, so gum is a substitute.