A sodium thiosulfate solution is standardized using pure copper as the primary standard. A sample of copper weighing 0.2624 g is dissolved in acid, excess KI is added, and the liberated iodine was titrated with 42.18 mL of sodium thiosulfate solution. Calculate the molarity of sodium thiosulfate solution. 2Cu2+ + 4I-  →   2CuI  + I2 I2 + 2S2O32- →   2I- +  S4O62-

25.00 mL of a sample containing Hg2²+ was titrated with 0.05789 M of KIO3, requiring 35.69 mL to reach the equivalence point. The titration reaction is: Hg22+ + 2103 → Hg2(103)2(s) What is the concentration of Hg22* in the sample?

Report sheet for Titration of vinegar   Part I:  Standardization of the NaOH solution with KHP                                                                                      Trial 1               Trial 2               Trial 3                          Mass of Erlenmeyer flask + KHP (g)                                   78.34               78.27               78.01 Mass of empty flask (g)                                                  77.12               77.12               77.12 Mass of KHP (g)                                                                1.22              1.15                 0.89    Final buret reading (mL)                                                31.35               30.53               27.71               Initial buret reading (mL)                                              16.35               15.78               14.20               Vol NaOH solution delivered (mL)…

You were assigned to assay a product sample of milk of magnesia. A 0.600-g sample was reacted with 25.00 mL 0.10590 N H2SO4 . The excess unreacted acid in the solution required 13.00 mL of 0.09500 N NaOH when titrated to reach the methyl red end point. Determine the dosage strength of the product in terms of % Mg(OH)2 content. Type your answer in 2 decimal places, numbers only.