Calibration of a glass electrode gave a reading of 126.5 mV with a 0.05 m potassium hydrogen phthalate buffer standard ( pH = 4.015), and a reading of -73.7 mV with a 0.008695 m potassium dihydrogen phosphate, 0.0343 m disodium hydrogen phosphate buffer standard (pH = 7400), both measured at 30 C. What is the observed slope (mV/pH unit) of the calibration curve?

In the titration of 25.00 mL of a water sample, it took 20.840 mL of 4.350x 10−3 M EDTA solution to reach the endpoint.   Calculate the number of moles of EDTA required to titrate the water sample. (enter your answer with 3 significant figures)

You are titrating 40.040.0 mL of 0.0100 M Sn2+Sn2+ in 1 M HCIHCI with 0.0500 M T13+T|3+ resulting in the formation of Sn4+Sn4+ and Tl+Tl+. A PtPt indicator electrode and a saturated Ag|AGCIAG|AgCl reference electrode are used to monitor the titration. Calculate the cell potential (EE) after each of the given volumes of the TI3+TI3+ titrant have been added. a. 1ml b. 4ml c.7.90ml d.8ml e.8.10ml f.13ml

Calculate Qsp for calcium fluoride (Ksp = 3.9 ×10^–11) when 225.0 mL of a 6.15×10^-3 M solution of Ca(NO3)2 is added to 290.0 mL of a 7.35×10^-3 M solution of KF.

Calculate Qsp for calcium fluoride (Ksp = 3.9 ×10–11) when 130.0 mL of a 6.05×10-3 M  solution of Ca(NO3)2 is added to 290.0 mL of a 7.95×10-3 M solution of KF.