A NAOH solution with an approximate concentration of 0.1 mol / L was produced in the laboratory. In order to obtain the exact concentration of this solution, its standardization was carried out, using a standard solution of oxalic acid (0.05 mol / L) and phenolpholine as an acid base indicator. The data obtained with the standardization were: H;C_0, + NaOH - Na* + C,0;- + H,0 Va = 10.00 mL, volume of NaOH solution added to the flask; Pv = 11.77 mL, spent volume of standard solution; Pv = 0.05, concentration of the standard solution; The unbalanced reaction of the system is shown below: From the data that was presented, answer: a) What is the real value of the concentration of NaOH (Ca). Present all the calculations and explanations necessary to arrive at the Ca value. b) Explain in a succinct way all the steps, experimental apparatus and necessary care to carry out a standardization experiment in the laboratory, based on the data presented in the statement

+ + Cl₂ H₂0 FeCl3 Hesou Xx + HCl

) Ph CO0OH 2) EALI, H30* 3)PCC

how does the excess citrate ion (C6H5O73‐) affect nanoparticle synthesis?

hydrogen peroxide → water + oxygen List two physical / chemical properties for each compound

Which molecules are enantiomers? Which molecules are the same? (A). H Br

Bromine (Br2₂) melts at 266 K and boils at 332 K. Which of the following is the best representation of bromine at 300 K? 。。。。 A A B с D

Give the noble gas shorthand notation (ex: [He] 2s2 2p1) for Br       Give the noble gas shorthand notation (ex: [He] 2s2 2p1) for Ca+2       Give the noble gas shorthand notation (ex: [He] 2s2 2p1) for Zn

How many grams of the 90% pure gold must a smith use with a 65% pure gold alloy to make 5000 grams of an alloy which will be 70% gold?

You have a 11.5 mg sample of blood that contains various proteins. Hemoglobin is the only protein in the sample containing Fe. Hemoglobin contains 3.83% by mass of a compound called heme (C₃₄H₃₂FeN₄O₄, MW = 616.49 g/mol). You find that your 11.5 mg blood sample contains 34.9 micrograms of Fe. What is the mass percent of hemoglobin in your protein sample?   -don't prematureley round