Answer Happy

Numeric Response Use the following information to answer the next question Colours Red 5 Purple 1 I. 2 Violet 6 Orange 3 Blue 7 Ź Colourless 4 Green 8 Yellow 20. Match the colours above to the results of the following tests Test Colour Flame test on KMnO4 record in first blank Solution colour of 1.0 mol/L KMnO4 record in second blank flame test on Nal record in third blank Solution colour for 1.0 mol/L Nal record in fourth blank Your answer. OOO DO00

Use the following information to answer the next question Titration of 10.0 mL of of nitrous acid with a standard solution of 0.250 mol/L sodium hydroxide with methyl orange indicator. Trial 1 2 3 4 14.80 26.90 39.80 13.60 0.70 13.90 26.90 Final Buret (mL) Initial Buret (mL) Volume of NaOH(aq) Methyl Orange 0.50 yellow orange orange orange 21. The concentration of nitrous acid is mol/L. (Record your answer in the numerical-response section below.) Your answer: 00000

22. If it takes 50.0 mL of 0.00100 mol/L NaOH(aq) to neutralize 15.9 mL of nitric acid, then the concentration of nitric acid in the solution is a.bcx100 mol/L. The values of a, b, c and d are - and (Record your four-digit answer in the numerical-response section below.) Your answer: 0000

23. A1.25 mol/L solution of sodium hydroxide, NaOH(aq), was used to titrate a 10.0 mL sample of hydrochloric acid, HCl(aq). If an average of 14.5 mL of NaOH(aq) was required to neutralize the acid sample, then the concentration of the HCl(aq) must have been mol/L. Record your three-digit answer. (Record your answer in the numerical-response section below.) Your answer: 0000