#10 SCH3U Lesson

Please help complete the table of finding the number of moles of KHP don't worry about the concentration of NaOH

*** this is not a graded assignment, I am double checking my answer key please. A vessel of calcium chloride solution (CaCl2) (2 Ca ions and 4 Cl ions represent a .1 M solution)  is mixed with  potassium carbonate (K2CO3) which should be drawn as .2M .Draw the reactant with the appropriate amount of K2CO3 particles in an empty box. The product calcium carbonate (CaCO3) forms a precipitate. Draw the appropriate example of the precipitate and the ions that remain in the solution. Add two water molecules around each ion in the solution.

Can someone provide a step-by-step answer for the following blanks in the second table? Thank you in advance! :)

Remaining Time: 1 hour, 01 minute, 47 seconds. * Question Completion Status: QUESTION 2 The number of water molecules in 2.3 mg of water is O 6.02 x 1023 O 77.0 x 1023 O 7.7 x 1023 O 7.7 x 1019 none of the above QUESTION 3 A ctudent makes a colution bu discolvina 254a ofNDOH int0 450 gof water Wh. Click Save and Submit to save and submit. Click Save All Answers to save all answer ere to search DELL

Name Lab Partner Section # Date Pre-Lab Assignment: Stoichiometry Lab 1. In a lab experiment similar to the one you are going to do, a student slowly added hy- drochloric acid (HCI) to an evaporating dish containing magnesium carbonate MgCO3. a. Complete and balance the following equation for the reaction between magnesium carbonate and hydrochloric acid. MgCO3 (s) + HCl (aq) → (aq) + H₂CO3(aq) (When writing the formula for the missing product did you consider the charges of the ions?) b. When carbonic acid is formed in a chemical reaction, it is unstable and immedi- ately decomposes into carbon dioxide and water. Rewrite the equation above to show the final products using this information.

A student uses TLC to monitor the progression of the reaction from question 1. After 30 minutes, the student develops the plate (right). Lane A = salicylic acid, Lane B = salicylic acid and reaction mixture, Lane C = reaction mixture. What does the student need to do next? A B C

Gravimetric Analysis of Calcium Carbonate and Hard Water Introduction In this laboratory activity, you will develop calculating skills and facility with the techniques of gravimetric analysis. In particular, we will practice quantitative transfer and vacuum filtration. You will perform a precipitation reaction that involves preparing and combining solutions of sodium carbonate, Na2CO3, and calcium chloride, CaCl2. The balanced chemical equation for this reaction predicts the amount of precipitate that will be formed. Careful isolation, drying and weighing of the precipitate will confirm the calculations and the percent yield. Pre-Lab Questions 1. Define the term gravimetric analysis. Describe the procedure used in this activity, and identify two other common examples of gravimetric analysis.

What type of chemical reaction?

Analytical chemistry

Please see image

How do I find the amount of NaOH moles dispensed?

Overall reaction: Nal NaOCl NH2 OH compound salicylamide sodium OH NH2 NaOCl (15 iodosalicylamide iodide % w/w) molecular weight 137.14 g/mol 149.89 g/mol 74.44 g/mol 263.03 g/mol mass used/formed volume used density moles used/formed mole ratio used/formed Mole ratio required 1 5 mL 1.07 g/mL 1 1 1 Note: mathematical workings must be shown for theoretical and %yield calculations. Mass of petri dish _ 6.084g Mass of petri dish + product 6.346g Experimental Yield 0.262

Average mass of the precipitate MgNH4PO4·6H2O (s) / g Average phosphate concentration in water sample (mass/volume %) % difference of 2 trials

Conductivity Table 1: Conductivity (mS/cm) of KCI Solutions of Various Concentrations (% w/v). Concentration (% w/v) Conductivity (mS/cm) 0.50 1.0 2.5 5.0 3.903 4.767 13.76 30.79 Data Analysis Using your data from your stock and dilute solutions, create a graph of Conductivity (mS/cm) vs. Molarity Concentration (M). Make sure your graph is attached to this report, and include the following: • Proper title for graph, and proper labels for x and y axis (with proper units) Include a line of best fit that represents the trend observed in your data • Use your trend line from your graph to complete the following statement: The conductivity of a KCI solution that has a concentration of 0.75 % (w/v) is ms/cm.

I need the answer as soon as possible

Balance the given chemical equation and then complete the reaction table based on the starting conditions represented in the atomic-scale picture. If you determine that a species should have a coefficient of 1, you must indicate this with the "1" label. Do not leave the coefficient space blank for any species in the balanced equation. = H2 1 = N2 H2(g) N2(g) NH3(g) Initial Chenn 14 of 15 Next > < Prev asus 2) 3. 4.