diff -r 5099df8ba6c6 -r e68b27ad8a40 src/EditRecipe.h
--- a/src/EditRecipe.h	Thu Apr 14 22:47:05 2022 +0200
+++ b/src/EditRecipe.h	Fri Apr 15 20:20:22 2022 +0200
@@ -303,6 +303,7 @@
     void on_mgcl2_changed(double val);
     void on_nahco3_changed(double val);
     void on_caco3_changed(double val);
+    void on_calc_acid_clicked();
 
     void on_perc_mash_valueChanged(int value);
     void on_perc_sugars_valueChanged(int value);
@@ -352,6 +353,12 @@
     void set_brewing_salt(QString salt, double val);
     void calcFermentables();
     void calcIBUs();
+    double ZAlkalinity(double pHZ);
+    double ZRA(double pHZ);
+    double BufferCapacity(Fermentables F);
+    double AcidRequired(double ZpH, Fermentables F);
+    double ProtonDeficit(double pHZ);
+    double MashpH();
     void calcWater();
 };