hello all first off if this has been answered already i apologize. i am doing as much research as i can but i'm not finding a solid answer anywhere. i am wondering if i can use baking soda in place of urea to neutralize the nitric in my aqua regia solution so i can precipitate gold. i have done my research in how to drop the other metals before going after the gold but all of the processes i have found require the use of urea. since this is not easy to obtain where i'm at i need a home remedy for this little problem i'm having. i really don't want to spend $35 to get 250 grams of urea if there is a way around it. also it may be improtant to mention that the aqua regia i am making is with very dilute nitric ( around 30% usually) so i use a little more than normal to make the reaction happen a little quicker. i'm also using 32% HCL instead of a concentrated HCL. any and all help is appreciated thanks in advance