A student combined Ba (s) and HCl (aq).  The student observed bubbling, thus a reaction occurred. Assign oxidation numbers to the reactants and products in the net ionic equation. Which reactant, Ba (s) or HCl (aq), got oxidized? Which reactant, Ba (s) or HCl (aq), got reduced?   Which reactant, Ba (s) or HCl (aq), is the oxidizing agent? Which reactant, Ba (s) or HCl (aq), is the reducing agent?

The hydronium ion concentration in a sample of springwater is found to be 5.2 ✕ 10−5 M at 15°C. What is the concentration (in M) of hydroxide ions in the springwater? (Kw = 4.57 ✕ 10−15 at this temperature.)

Sodium hydrogen carbonate (NaHCO3), also known as sodium bicarbonate or "baking soda", can be used to relieve acid indigestion. Acid indigestion is the burning sensation you get in your stomach when it contains too much hydrochloric acid (HCI), which the stomach secretes to help digest food. Drinking a glass of water containing dissolved NaHCO3 neutralizes excess HCl through this reaction: HCl(aq) + NaHCO3(aq) NaCl(aq) + H2O(l) + CO₂(9) The CO2 gas produced is what makes you burp after drinking the solution. Suppose the fluid in the stomach of a woman suffering from indigestion can be considered to be 250. mL of a 0.076 M HCl solution. What mass of NaHCO3 would she need to ingest to neutralize this much HCl ? Round your answer to 2 significant digits. x10 G

Which of the following reactions are redox reactions?    i)   2 C6H6 (l)   +   15 O2 (g)     ->     12 CO2 (g)   +    6 H2O (g)                                    ii)   Pb(NO3) 2 (aq)    +    2 KCl  (aq)    -->    PbCl2 (s)    +   2 KNO3(aq)                     iii)   3 Mg (s)    +   2 FeCl3 (aq)    -->    3 MgCl2 (aq)   +   2 Fe (s)

Sodium hydrogen carbonate (NaHCO3), also known as sodium bicarbonate or "baking soda", can be used to relieve acid indigestion. Acid indigestion is the burning sensation you get in your stomach when it contains too much hydrochloric acid (HCI), which the stomach secretes to help digest food. Drinking a glass of water containing dissolved NaHCO, neutralizes excess HCI through this reaction: HCl(aq) + NaHCO3(aq) NaCl(aq) + H₂O(1) + CO₂(g) The CO₂ gas produced is what makes you burp after drinking the solution. Suppose the fluid in the stomach of a man suffering from indigestion can be considered to be 200 ml of a 0.050 M HCI solution. What mass of NaHCO, would he need to ingest to neutralize this much HCI? Be sure your answer has the correct number of significant digits. X

Classify each of these reactions. Ba(CIO,),(s) → BaCl,(s) + 3 O,(g) 2 NaCl(aq) + K,S(aq) → Na, S(aq) + 2 KCI(aq) acid-base neutralization acid-base neutralization O precipitation O precipitation redox redox none of the above none of the above CaO(s) + CO,(g) –→ CaCO;(s) KOH(aq) + AgNO,(aq) → KNO, (aq) + AgOH(s) acid-base neutralization acid-base neutralization O precipitation O precipitation redox redox none of the above none of the above Ba(OH), (aq) + 2 HNO, (aq) → Ba(NO,),(aq) + 2 H,O(1) acid-base neutralization precipitation redox none of the above

O Chemical Reactions Standardizing a base solution by titration 3/5 Bis A chemistry student needs to standardize a fresh solution of sodium hydroxide. He carefully weighs out 36. mg of oxalic acid (H2C2O4), a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in 250. mL of distilled water. The student then titrates the oxalic acid solution with his sodium hydroxide solution. When the titration reaches the equivalence point, the student finds he has used 35.1 mL of sodium hydroxide solution. Calculate the molarity of the student's sodium hydroxide solution. Round your answer to 2 significant digits. Ом OP G

Sodium hydrogen carbonate (NaHCO3), also known as sodium bicarbonate or "baking soda", can be used to relieve acid indigestion. Acid indigestion is the burning sensation you get in your stomach when it contains too much hydrochloric acid (HCI), which the stomach secretes to help digest food. Drinking a glass of water containing dissolved NaHCO3 neutralizes excess HCl through this reaction: HCl(aq) + NaHCO3(aq) → NaCl(aq) + H2O(l) + CO2(g) ->> The CO2 gas produced is what makes you burp after drinking the solution. Suppose the fluid in the stomach of a man suffering from indigestion can be considered to be 100. mL of a 0.089 M HCl solution. What mass of NaHCO3 would he need to ingest to neutralize this much HCI? Round your answer to 2 significant digits. x10 x

7. Identify the given reactions as acid-base, redox, or precipitation reactions. 3NaOH(aq)+FeCl3(aq)=Fe(OH)3(s)+3NaCl(aq) LiOH(aq)+HCl(aq)=H2O(l) + LiCl(aq) 2H2(g)+ O2(g)=2H2O(g)

The reaction of hypothetical elements: A, B, C, D, and E, follows the molecular equation:   AB2(aq) + CDE(aq) -> AE(s) + CB(aq) + DB(aq)   Assuming that all aqueous compounds would fully dissociate, indicate the element/s that would form spectator ions in the subsequent total ionic equation.