"...saponification value for citric acid..."
It doesn't have a saponification value, so you will never find that information. The only chemicals that have sap values are the ones that make soap. Citric acid doesn't make soap.
Trisodium citrate dihydrate is what you want. This is the full technical name. The "common name" for this chemical is just sodium citrate.
If you are using sodium citrate, then NO extra lye is needed.
If you are using citric acid, then you need 6 g extra NaOH for every 10 g of citric acid. Or 6 oz extra NaOH for every 10 ounces of citric acid. However you say it, it means exactly the same proportion of lye to acid.
Yes, the precise number is different than this, but you'd need a lab quality scale to measure out the extra decimal places, so forgeddabout it. Rounding to 6 g is good enough for our kitchen chemistry.
