Please explain ur answer. 7. Which of the following species can act both as anacid and a base?a) Db) HNOc) H,SO,d) H,CO,e) HCO,8.9. The pK, for the given equilibrium is 7.20. H₂POHPO,² +H*The pH of a solution prepared by mixing 0.15 moles ofH₂PO, and 0.35 moles of HPO² is6.83b) 7.577.63d) 9.539. Which of the followings is NOT true?a)b)Tissue homogenization refers to breaking atissue and lysing cells to release cellular contentsDuring centrifugation, the solid that settles tothe bottom is called pellet and the remaining solutionis called supernatantc)During differential centrifugation, ideally, wewant to isolate morphologically intact andfunctionally active organellesAs the size of nuclei is bigger than that ofribosomes, a higher relative centrifugal force isrequired to sediment nuclei as compared toribosomesd)10.In one of the labs, you separated blue dextran(approximate molar mass 2,000,000 g/mol) andsodium salt of fluorescein (molar mass 376.28 g/mol)using size-exclusion chromatography. Based on theknowledge gained from that experiment, which of thefollowing is a TRUE statement?a) Blue dextran molecules are eluted first out of thecolumn first, because these molecules are too big tofit inside the pores and hence they flow through theinterparticle spaceb) Blue dextran molecules are eluted first out of thecolumn, because these molecules pass through thepores of the stationary phase gel particlesc) Fluorescein molecules are eluted first out of thecolumn, because these molecules pass through thepores of the stationary phase gel particlesd) Fluorescein molecules are eluted first out of thecolumn, because these molecules are too big to fitincide the noree and hence they flow through the

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7. Which of the following species can act both as an acid and a base? a) b) HNO, c) H,SO, d) H,CO, e) HCO

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter15: Acid–base Equilibria

Section: Chapter Questions

Problem 57P

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1) In the laboratory, a general chemistry student measured the pH of a 0.554 M aqueous solution of nitrous acid to be 1.787. Use this information she obtained to determine the Ka for this acid? Ka .......................... ? 2) How many grams of solid potassium hydroxide ( molar mass= 56.1 g/mol) are needed to react with 26.7 mL of a 1.75 M hydroiodic acid solution? KOH + HI......> kI + H2o ................ grams
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