and then weighed. For this lab‚ lead (II) nitrate (Pb(NO3)2) and potassium chromate (K2CrO4) will be reacted together to demonstrate double replacement reaction between 2 ionic compounds. This was shown when chromate replaced the nitrate and formed lead (II) chromate‚ and when the nitrate replaced the chromate and formed potassium nitrate‚ which is shown in the following equation: Pb(NO3)2 + K2CrO4 PbCrO4 + 2KNO3 In this experiment‚ I found that when two ionic compounds that are
Premium Ion Solubility Chemistry
Determination of the mole ratio of a chemical reaction The method of continuous variations is a means of determining the stoichiometric mole ratio of the reactants in a chemical reaction. The stoichiometric ratio‚ as given by the coefficients in the balanced chemical equation‚ represents the ratio at which chemicals must be combined to produce all product with no excess reactant. Since there is no “wasted” reactant‚ the maximum amount of product is made for the given amount of both reactants
Premium Chemistry Chemical reaction Chlorine
increases with temperature‚ favouring less solid and more ions‚ therefore the PbCl2 dissolves in hot water: PbCl2(s) → Pb2+ (aq) + 2 Cl-(aq) (4) Once Pb2+ has been put into solution‚ we can check for its presence by adding a solution of K2CrO4. The chromate ion‚ CrO42-‚ gives a yellow precipitate with Pb2+: Pb2+ (aq) + CrO42-(aq) → PbCrO4(s) (5) Yellow The other two insoluble chlorides‚ AgCl and Hg2Cl2‚ can be separated by adding aqueous ammonia. Silver chloride dissolves‚ forming
Premium Ammonia Solubility Acid
• KCl + BaSO4 → K2SO4 + BaCl2 Types of Chemical Reactions • Combination /Direct Combinationsynthesis • 2Na(s) + Cl2(g) → 2 NaCl(s) Single Displacement • single substitution • anion always replaces anion • cation always replaces cation • Mg + 2 HCl → MgCl2 + H2 • Complete the following Single Displacement (formula is correct) Al + CuSO4 Double Displacement • 2 substitutions • ion-exchange • MgSO4 + BaCl2 →BaSO4 + MgCl2 • Types
Free Chemical reaction Hydrogen Chemistry
Experiment No. 2: Dynamic Equilibrium and Le Chatelier’s Principle December 1‚ 2011 Final Formal Results Le Chatelier’s Principle states that “when a stress is applied to a chemical system at equilibrium‚ the equilibrium shifts in a direction that reduces the effect of stress” (Gross‚ Abenojar‚ and Tan 23). Moreover‚ it helps us “predict the direction of the shift of the equilibrium” (Silberberg 745). Silberberg also stated that there are three kinds of disturbances - concentration‚
Premium Management Balance sheet Generally Accepted Accounting Principles
anions would have created a precipitate in a different color. After centrifuging and separating the sample we added BaCl2 which resulted in another white precipitate. The reaction showed that Na2SO4 must have been present and not Na2CO3 because there was no brown precipitate formed in the previous reaction and Na2SO4 would have been the only anion to create a white precipitate with BaCl2. After adding both reagents it was clear that unknown sample 1 contained NaCl and
Premium Chemistry Solubility Separation process
allowed the PbCl2 to dissolve. The supernatant fluid containing the Pb(II) ions was then separated from the solid mercury(I) ions and solid silver ions decanting‚ adding a drop of acetic acid to the supernatant fluid‚ and also adding two drops of K2CrO4 to the test tube. A milky yellow mixture was observed as this indicated the presence of the lead (II) ion. This insoluble yellow precipitate was the insoluble compound of PbCrO4. In part 2 of the experiment‚ after the supernatant
Free Solubility Solid Precipitation
A double displacement reaction is a type of chemical reaction in which two compounds react in order to create two new chemicals. The two cations and anions switch places with each other which forms two new compounds. As an example AB+CC can switch to AD+CB. Both sides of these equations must balance out in order to be neutral. So any pairs of compounds (such as A+B) must have a total balanced charge. In this example A could have a charge of positive 2 (+2) and B could have a charge of negative
Premium Chemistry Chemical reaction Chlorine
re-weighed. This process was repeated‚ heating for about4 minutes each time‚ until two successive balances reading were within 0.002g of each other‚ at this point the contents were at constant mass‚ and all of the water had been removed. The value of n in BaCl2.nH2O was then
Premium Chemistry Water Solution
Cl-‚ chloride SO42-‚ sulfate NO3-‚ nitrate After having determined the chemical reactions of the individual ions‚ you will be asked to identify the ions present in an unknown mixture. CHEMICAL REACTIONS OF INDIVIDUAL ANIONS 1. The BaCl2 Test Take a set of four small test tubes. After cleaning them‚ label them 1 through 4‚ and place 4-5 drops of one of the known solutions in each tube as follows: Test tube Known Solution 1 PO43-‚ phosphate 2 SO42-‚ sulfate 3
Premium Ion Solubility Ammonia