Many salts have basic properties because their anion can accept a proton from water. One example is sodium fluoride, sometimes used in toothpaste. F-(aq) + H2O(l) ⇌ HF(aq) + OH-(aq)                                                                                                                                        Find the concentration of hydroxide ions in an 0.07 mol/L aqueous solution, something close to what one could find in a typical toothpaste.[1] The fluoride ion’s Kb is 2.9 × 10-11. Show your work. An IRE or IREC table is not required but recommended. Justify any approximation you may make. What are the pOH and pH of the solution described in (a) (to 1 decimal figures)? You may assume a temperature of 25 °C. Show your work. If you were unable to solve (a), do your calculation with 0.00330 mol/L hydroxide ions.

1. Many salts have basic properties because their anion can accept a proton from water. One example is sodium fluoride, sometimes used in toothpaste.
   
   

F^-(aq) + H₂O(l) ⇌ HF(aq) + OH^-(aq)
                                                                                                                                      

1. Find the concentration of hydroxide ions in an 0.07 mol/L aqueous solution, something close to what one could find in a typical toothpaste.[1] The fluoride ion’s K_b is 2.9 × 10^-11. Show your work. An IRE or IREC table is not required but recommended. Justify any approximation you may make.
   
   
   
   
2. What are the pOH and pH of the solution described in (a) (to 1 decimal figures)? You may assume a temperature of 25 °C. Show your work. If you were unable to solve (a), do your calculation with 0.00330 mol/L hydroxide ions.