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No
You can but you need to add baking powder and salt to it.
No. Self raising flour already has baking soda mixed into it (which is another leavening agent used in cake baking)
Self raising flour makes the cake rise, but if you don't have any you can use plain flour and baking powder which has the same effect. 225g plain flour and 4 teaspoons baking powder, will transform it into self raising flour.
Self-rising flour has baking soda, baking powder and salt added in. All-purpose flour does not have these ingredients, so you have to mix them in if the recipe calls for them. For recipes that call for all-purpose flour, and you are using self-rising flour, you can leave these ingredients out.
self raising flour is basically plain flour with baking powder in it so for a cake you can use plain flour with baking powder but it is easier to use self raising and it also has other raising agents. you need to use it to make you cake rise, if your cake didn't rise it would be small and very dense making its texture not as nice to consume.
There is not a standard amount - it varies according to what you are cooking. If you wish to turn plain flour into self-raising, you need baking powder (which is a 1:3 ratio of bicarbonate of soda to cream of tartar). You need one teaspoon of baking powder to a cup of plain flour to create self-raising flour.
Generally you use 1 to 2 teaspoons of baking powder to each cup of flour.
Self raising flour has the salt and baking powder included. Plain flour does not.Self rising flour is a combination of flour, baking powder, and a little salt. It's not just flour.
Add one rounded teaspoon of baking powder to each cup of flour. I frequently do this and it always work. Note - not a flat teaspoon of baking powder, not a heaped teaspoon but a rounded teaspoon!
Most recipes use 1 teaspoon of baking powder to 1 cup of flour.
I suppose you meant "turn8oz of plain flour into self raising flour". I found this on a website, hope this helps but hopefully you would have found it already.3tsp of baking powder per 8oz of plain flour = Self Raising Flour