I have food grade lye (sodium hydroxide) from pretzel making and I want to make chewy noodles, either ramen or Chinese noodles. Many of these recipes call for lye water or kansui.
I have found many resources about making your own kansui from baking soda (for example Can I substitute baking soda for kansui powder?), but none that start with lye.
I've found that kansui has a pH of about 12.6 and sodium hydroxide (NaOH) has a pH of 14. Using a pH calculator, I should get a pH of 12.6 with 0.04 moles of NaOH in 1 liter of solute (water). That's 1.5 grams per liter. (It has been a while since high school chemistry so please jump in here if I'm making a massive mistake)
Is this a valid approach to making lye water or kansui? What might I be overlooking?