A 0.2121-g sample of pure NazC,O, (134.00 g/mol) was titrated with 43.31 mL of KMNO4. What is the normality of the KMNO, solution? The chemical reac- tion is 2MNO + 5C,O;- + 16H* → 2Mn²+ + 10CO, + 8H20

A student weighs out 0.213 g MgCl2·H2O (Mw = 131.235 g mol-1) of and 0.167 g of NaOH (Mw = 39.997 g mol-1 ) and dissolves both these in DI water to make up two separate solution. What are the mole amounts of both these reagents and which is the limiting reagent?

ps://openvellum.ecollege.com/course.html?courseld=16594544&OpenVellumHMAC=e0a02f77f7d1 回☆ 21 v Part G Calculate (OH\for a solution formed by adding 4.10 mL of 0.100 M KOH to 10.0 mL of 6.3 x 102M C Ca(OH)2. Express your answer using two significant figures. [OH]]= 0.33 %3D M

(a) You are about to prepare three solutions of 0.5 M KI, 0.01 M K2S2O8, and 0.01 M Na2S2O3*5H2O in 250 mL volumetric flasks. - Describe how you will go about this, i,e, explain all steps of weighing of solutes, volumetric measurements (filling up with deionised water) ect. Calculate what mass of solute you will need in each of solutions mentioned above that you need to prepare. Show all calculations steps. (b) You are also tasked to fill burettes with the above-mentioned solutions, however, after filling up the solutions, you realised that there is a bubble towards the bottom tip inside the burette. Is it wise to continue with the experiment, while there is a bubble, if NOT explain why. (c) According to the manual's Experimental procedure, one conical flask (flask 1) contains a mixture of 20 mL of the KI solution plus 10 mL of the Na2S2O3 solution, while in the second flask (flask 2) there is 20 mL of the K2S2O8 solution with added five drops of starch solution. Why can't you add…

7. Distinguish between the solute and solvent in each of the following solutions: (a) saltwater (NaCkaq)l: (b) sterling silver (92.5% Ag, 7.5% Cu); (c) air (about 80% N,, 20% O,). On what do you base your distinctions? Sterling silver is an aloy of 92.5% silver and 7.5% another metal, usually copper. Yuny Maksymemke Shutterstock.com

4 help use sig figs

At what temperature will 150 grams of KI saturate the solution?

All are requirements for bilirubin specimens EXCEPT:     Question 32 options:   A)  protect from light   B)  serum   C)  avoid hemolysis   D)  transport on ice

Cr.  In a particular gravimetric analysis of a 0.5210 g sample of plant food, the ma (MgNHPO-6H,O) after drying in the oven is 0.2385 g. What is the calculati phosphorous (% P) in this sample of plant food?

KNO3 at 60oC