A 0.9600 M NaOH solution was diluted with a factor of 4. Then the diluted solution of NaOH was titrated against an unknown acid. The volumes of NaOH(aq) titrated are shown in the table below. Volumes of NaOH(aq): Rough titration First titration Second titration Third titration Third titration Final burette reading: (mL) 19.00 34.05 20.86 36.01 23.57 Initial burette reading: (mL) 19.00 19.07 5.76 21.02 8.54 The molarity of the unknown acid is 0.08108 M and the volume of the unknown acid used in each titration is 14.80 mL. (i) Was the unknown acid monoprotic, diprotic or triprotic? Show your calculations and reasoning. (ii) What type of chemical reaction is this? _________________ or ________________
A 0.9600 M NaOH solution was diluted with a factor of 4. Then the diluted solution of NaOH was titrated against an unknown acid. The volumes of NaOH(aq) titrated are shown in the table below. Volumes of NaOH(aq): Rough titration First titration Second titration Third titration Third titration Final burette reading: (mL) 19.00 34.05 20.86 36.01 23.57 Initial burette reading: (mL) 19.00 19.07 5.76 21.02 8.54 The molarity of the unknown acid is 0.08108 M and the volume of the unknown acid used in each titration is 14.80 mL. (i) Was the unknown acid monoprotic, diprotic or triprotic? Show your calculations and reasoning. (ii) What type of
In the laboratory, what would you use for the following? (a) To measure the temperature of water _______________________________________________ (b) To get out of the lab immediately in an emergency ____________________________________ (c) To measure 5.50 g of CuSO4·5H2O ________________________________________________ (d) To clean your eye after a chemical has accidentally got into it ___________________________ (e) To put out (stop) a small fire _____________________________________________________ (f) To dry CuSO4 over silica gel and prevent it from absorbing water ________________________ (g) To perform a chemical reaction which produces a poisonous gas ___________________ (h) To measure 8.37 mL of HNO3(aq) ___________________ or______________________ (i) To determine the isotopes of silicon ________________________________________________ (j) To hold a burette and a pipette during a titration ______________________________________ (k) To protect your eyes ____________________________________________________________ (l) To determine the end point of a titration ____________________________________________ (m) To hold test tubes so that they do not roll off the bench and break ________________________ (n) To prepare 250.00 mL of sodium hydroxide solution __________________________________________________ (o) To hold a very hot crucible _______________________________________________________
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