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By myababy Mar 29, 2009 252 Words
Qualitative Observations of Double Displacement Reactions Lab

Table 1.0 Qualitative Observation of Products Formed

|Balanced Chemical Equations |Qualitative Observations | |BaCl2 (aq) + 2NaOH (aq)( BaOH2(aq) + 2NaCl(s) |An aqueous solution formed | | |Precipitate | | |Opaque and translucent | |FeCl3 (aq) + 3NaOH(aq) ( FeNa3 (aq) + 3ClOH(s) |Transparent | | |Colour change( hint of yellow | | |Aqueous | |BaCl2 (aq) + NO2SO4 (aq) ( 2NaCl(aq) + BaSO4(aq) |Precipitate | | |Colour change( White | | |Aqueous | | |Opaque | |CaCl2(aq) + 2AgNO3 (aq) ( Ca(NO3)2 (aq) + 2AgCl(s) |Opaque | | |Aqueous | | |Colour change ( White | |AgNO3 (aq) + KI (aq) ( AgI(s) + KNO3 (aq) |Colour change ( greenish yellow | | |Precipitate | | |Opaque | |BaCl2(aq) + 2AgNO3(aq) ( Ba(NO3)2 (aq) + 2AgCl(s) |Hint of blue | | |Opaque | | |Aqueous solution | |FeCl3(aq) + CaCl2 (aq) ( N.R. |Substance looked the same | |KI (aq) + Na2SO4 (aq) ( N.R. |Substance looked the same | |BaCl2(aq) + KCl (aq) ( N.R. |Substance looked the same |

Lab Questions

1. It can be predicted that a precipitate will form by looking at the two reactants and seeing if they are soluble. If they are soluble, they are put into a basic double displacement equation (AB + CD = AD + BC) to see what products could possibly be formed. If the products turn out to be insoluble, then the reaction forms a precipitate. 2. (a) We could tell if a reaction took place during the lab by observing the qualitative changes in the substance. For example if there was a change in colour, change in state or if bubbles/ precipitate was formed. (b) KNO3 (aq) + NaI(aq) ( KI (aq) + NaNO3 (aq)

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