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Konstruk Konteks / Topik Aras Markah Skema

Sintesis Neutralisation Tinggi 1 A

Kertas 1

What is the property of a solution produced when 10 cm3 of 0.5 mol dm-3 of sodium hydroide is addedinto 50 cm3 of 0.! mol dm-3 of hydrochloric acid "

# The solution turns methyl orange red.

## The solution contains water molecules with sodium and chloride ions only.### The solution has a p$ %alue greater than &.

#' The solution is neutral.A # only ( #' only

) ## only * ## and #' only

Soalan

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Kertas 2

Konstruk Konteks / Topik Aras Markah

Sintesis The Strength of Acids and )ases Tinggi 1

Sintesis The Strength of Acids and )ases Tinggi !

Sintesis Acids and )ases Tinggi !

Soalan

A student is carried out two eperiment to in%estigate the acidity of two different acids+ 0.5 mol dm-3 of

each hydrochloric acid and ethanoic acid.#n the eperiments+ 10 g of calcium car,onate is added to two ,eaers each containing 100.0 cm3 of

hydrochloric acid and ethanoic acid respecti%ely as shown ,elows

/periment # 100.0 cm3 of hydrochloric acid 10 g of calcium car,onate

/periment ## 100.0 cm3 of ethanoic acid 10 g of calcium car,onate

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,2 i2 (ompare the o,ser%ations in ,oth /periment # and /periment ##.

  ii2 /plain the differences of the o,ser%ations in ,2i2.

c2 Write the ,alanced chemical euation for /periment #.

Skema :

,2i2 /ffer%escence occurs more %igorously in /periment # compares to /periment ## 4 (alcium

car,onate in /periment # is dissol%es faster than that in /periment ##.ii2 - $ydrochloric acid is a strong acid that ionises completely in water+ while ethanoic acid is a wea 

  acid that ionises partially in water.- The concentration of hydrogen ions in hydrochloric acid is higher than that of in ethanoic acid.

c2 !$(l (a(3 →  (a(l!  (!  $!