Interpretation: To predict the calcium compound among the following that does not dissolve in hydrochloric acid.
Concept introduction: Calcium is one of the most abundant elements found on earth. It is an alkaline earth metal and belongs to group
Calcium Oxide is quick lime and is a white, amorphous solid. Calcium hydroxide is known as slaked lime. Both are slightly soluble in water and dissolve in acids. Calcium carbonate is present in limestone and chalk. The hydrated calcium sulfate is known as gypsum. Cement also contains calcium. Hydroxyapatite is also a type of calcium compound found in tooth enamel.
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Chemistry & Chemical Reactivity
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- A sample of 70.5 mg of potassium phosphate is added to 15.0 mL of 0.050 M silver nitrate, resulting in the formation of aprecipitate. (a) Write the molecular equation for the reaction. (b) What is the limiting reactant in the reaction? (c) Calculatethe theoretical yield, in grams, of the precipitate that forms.arrow_forwardConsider the series of reactions to synthesize the alum (KAl(SO4 )2 · xH2O(s)) from the introduction. (a) Assuming an excess of the other reagents, from one mole of aluminum Al (s), how many moles of alum will be produced? (b) Assuming an excess of the other reagents, from one mole of potassium hydroxide KOH, how many moles of alum will be produced? (c) Assuming an excess of the other reagents, from one mole of sulfuric acid H2SO4 , how many moles of alum will be produced? (d) If you start the synthesis with 1.00 g of Al, 40.0 mL of 1.50 M KOH, and 20.0 mL of 9.00 M H2SO4 , which of the three will be the limiting reagent? (e) Assuming that the product is anhydrous (that there are no waters of hydration), calculate the theoretical yield of alum, in grams, based on the amounts of reagents in part (d). 3. Consider the nickel salt: (NH4 )2Ni(SO4 )2 ·y H2O (Ammonium Nickel Sulfate Hydrate), where y is the number of coordinated waters. (a) Assuming that the product is anhydrous (y = 0),…arrow_forward2. (Balance the equation) FeCl+NaOH>Fe(OH);+Naclarrow_forward
- 36. Balance these ionic redox equations using the ion- electron method. These reactions occur in basic solution.arrow_forwardBalance the following equations:arrow_forward(A) if both sentences are true,(B) if both sentences are false,(C) if the first sentence is true but the second is false, and(D) if the first sentence is false but the second is true. 1. In a redox reaction, the oxidation number of iron changed from +2 to +3; thus, sulfur is a reducing agent. In a redox reaction, the oxidation number of nitrogen was unchanged; thus, nitrogen is an oxidant. 2. In a redox reaction, the reducing agent is oxidized and it gains electrons. In a redox reaction, the oxidizing agent is reduced and it gains electrons. 3. Bending stress is also known as flexural stress. The test used in observing the mechanical strength of chocolate is the three-point bend test. 4. The flexural strength of materials may be expressed in Pascals. Magnesium is more reactive than silver; therefore, magnesium corrodes faster than silver with the aid of air, oxygen, and sea water.arrow_forward
- Balance the following equations. (Use the smallest whole numbers possible. Enter 1 where appropriate - do not leave any answer box blank.) (a) CAH100() + ]O2(@) → CO,(g) + H20() (b) CH4(g) + |a,(g) → CCI,(1) + HCI(g) (c) Fe(OH)2(s) + H2S(g) - Fe S3(s) + H20(g)arrow_forwardPhosphoric acid, one of the acids used in some cola drinks, is produced by the reaction of phosphorus(V) oxide, an acidic oxide, with water. Phosphorus(V) oxide is prepared by the combustion of phosphorus.(a) Write the empirical formula of phosphorus(V) oxide.(b) What is the molecular formula of phosphorus(V) oxide if the molar mass is about 280.(c) Write balanced equations for the production of phosphorus(V) oxide and phosphoric acid.(d) Determine the mass of phosphorus required to make 1.00 × 104 kg of phosphoric acid, assuming a yield of 98.85%.arrow_forward(a) Predict the identity of the precipitate that forms when solutions of BaCl, and K,SO, are mixed. (b) Write the balanced chemical equation for the reaction.arrow_forward
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