5. Determine the pH of the solution which has 10% of NaOH in deionized water by mass. The NaOH which was used to prepare 10% solution has a density of 1.131kg/L. Assumption: 100 % dissociation. N2OH + Na* + OH

Calculate the pH of the solution that results following addition of 30 mL of 1 M NaOH to 40 mL of 1 M NH4Cl.

Q6

Each row of the table below describes an aqueous solution at 25 °C. The second column of the table shows the initial components of the solution. • Use the checkboxes in the third column to explain the type of the initial solution. The fourth column describes a change in the solution. • Use the fifth column to predict how the change in the solution will change its pH. alo initial type (check all that apply) effect of change on pH (check one) solution initial components change O acidic pH higher н,о, Кон A basic add H Cl pH lower O neutral O pH the same O acidic O pH higher В Н,0, КОН O basic add K CI O pH lower neutral O pH the same O acidic O pH higher H,0 O basic add Na ClO, O pH lower O neutral O pH the same O acidic O pH higher H,0 O basic add Na OH O pH lower O neutral O pH the same Explanation Check © 2021 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center Accessibility

1. a. Tris (C4H6(OH)3NH2) has a Ka of 7.94 x 10−9. Calculate the Kbfor this compound. b. If a chemist was to make 50.0 mL 0.20 M solution of Tris, what would the pH be after an addition of 10.0 mL of 0.10 M HCl?

Help with the following question. Please round the answer to 2 significant digits 

18.   A. Calculate [OH−] for this strong base solution: 7.3×10−2 M KOH and then it's pH   B. Calculate [OH−] for this strong base solution: 10.0 mL of 1.00×10−2 M Ca(OH)2 diluted to 500.0 mL and it's pH   C. Calculate [OH−] for the strong base solution formed by mixing 10.0 mL of 1.50×10−2 M Ba(OH)2 with 34.0 mL of 6.0×10−3 M NaOH and it's pH

Consider a solution of Hydrofluoric acid at equilibrium as follows:HF (aq)+H2O (l) F ̄ (aq)+H3O+ (aq) a.Suppose a strong base (OH-) is added to the buffer system above. Which two species could react and why? b.Write the chemical reaction for the reaction of hydroxide ion (OH-) being neutralized by reacting with the hydrofluoric acid. c.Explain why the addition of a small amount of strong base will not cause a significant change in the pH of the solution as long as the HF is not used up. d. Suppose a strong acid (H3O+) is added to the buffer system above. Which species could react and why? e.Write the chemical reaction for the reaction of hydronium ion (H3O+) being neutralized by reacting with the fluoride ion. f.Explain why the addition of a small amount of strong acid will not cause a significant change in the pH of the solution as long as the fluoride ion (F ̄) is not used up.

I don’t understand this problem. Please help.