276 M. L. v. Karolyi on the Products of 



manganese by mixing a litre of the liquid with a solution of this 

 salt which had been previously fused ; a precipitate of carbonate 

 of manganese was obtained, the carbonic acid of which, deter- 

 mined in the usual manner, corresponded to 2*8337 grms. in 

 the entire residue. 



3. Hyposulphite of Potash. — The sulphide of silver (2) weighed 

 on the tared filter, when dried at 120°, 0*2261 grm., which cor- 

 responds to 0*1733 grm. hyposulphite of potash ; hence the entire 

 residue contained 1*0400 grm. hyposulphite of potash. 



A determination of the hyposulphite was also made by metrical 

 analysis. A litre of the solution was acidulated with acetic acid, 

 mixed with starch, and determined by means of a standard solu- 

 tion of iodine. A litre required 22*57 cubic centims. iodine 



2KO S 2 O 2 



solution; hence, according to the formula s=a — — y =£, 



in which £=22*57, a = 0*000517; this litre contained 0*1746 

 grm. hyposulphite of potash, and the entire residue 1*0476 grm. 

 of this salt. 



4. Sesquicarbonate of Ammonia, — According to Bunsen's 

 method, a litre of the liquid was boiled with caustic potash, the 

 distillate passed into a solution of hydrochloric acid of known 

 strength, and the hydrochloric acid which had not been changed 

 to chloride of ammonium determined with a standard ammonia 

 solution. I found a = 0*04853, the quantity of hydrochloric 

 acid taken; £=19*87, the number of divisions of an ammoniacal 

 liquid which would have saturated a volume of hydrochloric 

 acid equal to that taken with £' = 41*30 divisions of the burette. 



•". '", ■ , 2NH 4 0,3COs*(£ / -£) lf a * -a. 

 Using the formula x= Wuc\ /' 3 * ound m ttie 



\ litre the sesquicarbonate of ammonia to be 0*041275 grm. ; 

 hence 0*9908 grm. corresponds to the entire quantity of sesqui- 

 carbonate of ammonia. 



5. Carbonate of Potash.— Subtracting the carbonic acid in the 

 sesquicarbonate of ammonia =0*5541 grm. from the total quan- 

 tity found (2), =2*8337 grms., there remains a quantity corre- 

 sponding to the carbonate of potash =2*2796 grms. Hence the 

 entire residue contains 7*1498 grms. carbonate of potash. 



6. Sulphate of Potash.— Alitveot the liquid mixed with chlo- 

 ride of barium gave 3*0244 grms. sulphate of baryta, which cor- 

 responds to 2*2683 grms. sulphate of potash for one litre of 

 liquid, and 13*6100 grms. for the whole residue. 



7. Potash. — To determine the entire quantity of potash con- 

 tained in the various salts, a litre of the liquid was carefully 

 evaporated to dryness with sulphuric acid and ignited in a pla- 

 tinum vessel. 3*8466 grms. of sulphate of potash were thus 



