What was the equation if k_{\mathrm{h,px}} = \frac{p}{x} is 12.30 × 10?
CREATE TABLE "table1_238199_1" (
  "equation" text,
  "k_mathrm_h_pc_frac_p_c_mathrm_aq" text,
  "k_mathrm_h_cp_frac_c_mathrm_aq_p" text,
  "k_mathrm_h_px_frac_p_x" text,
  "k_mathrm_h_cc_frac_c_mathrm_aq_c_mathrm_gas" text
);
SELECT "equation" FROM "table1_238199_1" WHERE "k_mathrm_h_px_frac_p_x"='12.30 × 10';