Process for the preparation of acid addition salts of the pyrazoles of the general formula: with the meaning R 1, R 2, independently of one another, hydrogen, halogen, nitro or C 1-20 -alkyl, C 3-8 -cycloalkyl, C 6-12 -aryl, C 7-13 -alkylaryl or C 7-13 -aralkyl optionally substituted by C 1-4 -alkyl, halogen and/or nitro, R 3 hydrogen or C 1-20 -alkyl, C 3-8 -cycloalkyl, C 6-12 -aryl, C 7-13 -alkylaryl or C 7-13 -aralkyl optionally substituted by C 1-4 -alkyl, halogen and/or nitro, by reaction of carbonyl compounds of the general formula R 1 -CH 2 -CO-R 2 with the meanings given for R 1 and R 2 in the presence of a strong base with formate esters of the general formula H-COOR 4, in which R 4 means C 1-8 -alkyl, or with carbon monoxide, subsequent reaction of the intermediate formed with hydrazines of the general formula R 3 -NH-NH 2 with the meaning given for R 3 in the presence of inorganic or organic acids, and dissolution of the pyrazoles of the general formula thus obtained in water or an organic solvent, subsequent reaction with at least equimolar amounts of orthophosphoric acid or oxalic acid and separation by crystallization of the acid addition salts obtained; in which the intermediate from stage is reacted further directly in stage without separation from the reaction mixture or additional purification. R 1, R 2, independently of one another, hydrogen, halogen, nitro or C 1-20 -alkyl, C 3-8 -cycloalkyl, C 6-12 -aryl, C 7-13 -alkylaryl or C 7-13 -aralkyl optionally substituted by C 1-4 -alkyl, halogen and/or nitro, R 3 hydrogen or C 1-20 -alkyl, C 3-8 -cycloalkyl, C 6-12 -aryl, C 7-13 -alkylaryl or C 7-13 -aralkyl optionally substituted by C 1-4 -alkyl, halogen and/or nitro, by reaction of carbonyl compounds of the general formula R 1 -CH 2 -CO-R 2 with the meanings given for R 1 and R 2 in the presence of a strong base with formate esters of the general formula H-COOR 4, in which R 4 means C 1-8 -alkyl, or with carbon monoxide, subsequent reaction of the intermediate formed with hydrazines of the general formula R 3 -NH-NH 2 with the meaning given for R 3 in the presence of inorganic or organic acids, and dissolution of the pyrazoles of the general formula thus obtained in water or an organic solvent, subsequent reaction with at least equimolar amounts of orthophosphoric acid or oxalic acid and separation by crystallization of the acid addition salts obtained; in which the intermediate from stage is reacted further directly in stage without separation from the reaction mixture or additional purification. reaction of carbonyl compounds of the general formula R 1 -CH 2 -CO-R 2 with the meanings given for R 1 and R 2 in the presence of a strong base with formate esters of the general formula H-COOR 4, in which R 4 means C 1-8 -alkyl, or with carbon monoxide, subsequent reaction of the intermediate formed with hydrazines of the general formula R 3 -NH-NH 2 with the meaning given for R 3 in the presence of inorganic or organic acids, and dissolution of the pyrazoles of the general formula thus obtained in water or an organic solvent, subsequent reaction with at least equimolar amounts of orthophosphoric acid or oxalic acid and separation by crystallization of the acid addition salts obtained;