- A sample of feldspar weighing 1.500g is decomposed, and eventually there is obtained a mixture of KCI and NaCl weighing 0.1801 g. These chlorides are dissolved in H,0, a 50-mL pipetful of 0.08333 N. AGNO3 is added, and the precipitate is filtered off. The filtrate requires 16.47 mL of 0.100OON KCNS, with ferric alum as indicator. Calculate the percentage of K20 in the silicate.
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- A sample of feldspar weighing 1.500g is decomposed, and eventually there is obtained a mixture of KCl and NaCl weighing 0.1801 g. These chlorides are dissolved in H2O, a 50-mL pipetful of 0.08333 N AGNO3 is added, and the precipitate is filtered off. The filtrate requires 16.47 mL of 0.1000N KCNS, with ferric alum as indicator. Calculate the percentage of K2O in the silicate.A 0.4852g sample of an iron ore was dissolved in acid to the 3+ state, then precipitated as Fe2O3 x H2O. The pp was filtered, washed and calcined to Fe2O3, which gave a weight of 0.2481g. Calculate the Fe % in the sample.4. From a pyrite concentrate containing 65% by weight pyrite (FeS,) by total oxdizer roasting, the following Fe,03 is produced according to the reaction. 5 tons of pyrite concentrate is reasted daily (MA, g/ mol; Fe 56; S: 32; O: 16; H: 1). 2FES2+11/20, Fe,03 + 450, If it is desired to produce 95% sulfuric acid from the flue gases, how much sulfuric acid by volume is produced in 1 day? (d.atunk anste 95%: 1.84 g/ cm2)
- (a) What is the percentage of MnO2 in a pyrolusite ore if a sample weighing 0.4000 g is treated with a 0.6000 g of pure H2C2O4.2H20 and dilute H2SO4 and after reduction has taken place (MnO2 + H2C2O4 + 2H+ Mn2+ + 2CO2 + 2H2O), the excess oxalic acid requires 26.26 mL of 0.1000 N KMNO4 for titration? (b) If pure As2O3 were used instead of oxalic acid, how many grams would be required in order for the other numerical data to remain the same?A sample of steel weighing 2.00 g is analyzed for Cr (AW 52.0). The Cr is oxidized into chromate with alkaline permanganate and the excess permanganate is destroyed. A certain volume of 0.120 M FeSO, is added to the acid solution and the excess is titrated with 0.0220 M KMNO4, requiring 31.0 mL. If the sample contained 0.50 % Cr, what volume (in mL) of FeSO, was added?A sample of steel weighing 2.00 g is analyzed for Cr (AW 52.0). The Cr is oxidized into chromate with alkaline permanganate and the excess permanganate is destroyed. A certain volume of 0.120 M FeSO4 is added to the acid solution and the excess is titrated with 0.0220 M KMnO4, requiring 31.0 mL. If the sample contained 0.50 % Cr, what volume (in mL) of FeSO4 was added?
- (a) What is the percentage of MnO, in a pyrolusite ore if a sample weighing 0.4000 g is treated with a 0.6000 g of pure H2C2O4.2H20 and dilute H,SO4 and after reduction has taken place (MnO2 + H2C204 + 2H* → Mn2+ + 2CO, + 2H,O), the excess oxalic acid requires 26.26 mL of 0.1000 N KMnO4 for titration? (b) If pure As,03 were used instead of oxalic acid, how many grams would be required in order for the other numerical data to remain the same?5. 0.1500 g sample of chromium ore was dissolved and the chromium oxidized to chromate ion. The solution was treated with 25.00 mL of 0.3500 M AGNO3. The resulting precipitate, from the reaction of the excess and analyte in 1: 1 mole relationship, Ag2CrO4 was removed and discarded. The excess AGNO3 required 30.50 mL of 0.200 M KSCN for titration in a 1:1 mole relationship. Calculate the % Cr2O3 in the ore if the mole relationship between Cr2O3 and CrO42- is 1:2 respectively.A sílicate ore contains 12.00% Na,0 and weighs 0.5000 gram. On analysis by the J.L. Smith method, the sample yielded 0.1500 g of a mixture of NaCl + KA. What weight of K2PtCl, was obtained from the mixture of chlorides?
- Solution for 0.105g of the K3[Fe(C2O4)3] (MW= 437.2 g/ mol) were dissolved in sulfuric acid and got rated with 9 mL of 0.028M KMn04. What is the experimental weight percent of oxalate in the sample?A sedimentary rock sample with mass 0.7600 g gave an ignited residue of mixed oxides, SeO, and As2O3 with a mass of 0.0704 g. In a separate analysis the original sample was found to contain 2.65% Se (w/w). Calculate the weight percentage As in the sedimentary rock sample. [Molar masses (g mol-): As203 = 197.8414; SeO3= 126.9582; As = 74.9216; Se = 78.96](a) What is the percentage of MnO2 in a pyrolusite ore if a sample weighing 0.4000g is treated with 0.6000g of pure H2C2O4•2H2O and dilute H2SO4 and after reduction has taken place (MnO2 + H2C2O4 + 2H+→ Mn2++ 2CO2 + 2H2O), the excess oxalic acid requires 26.26ml of 0.1000N KMnO4 for titration? (b) If pure As2O3 were used instead of oxalic acid, how many grams would be required in order for the other numerical data to remain the same?