Each row of the table below describes an aqueous solution at 25°C. The second co

Question

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. solution initial components (check all that apply) initial type effect of change on pH change (check one) O pH higher 0 pH lower o acidic AH,0, Na0H basic neutral 041 C) lower add HCIO4 | acidic basic o neutral o acidic basic neutral acidic o basic n neutral pH the same O pH higher O pH lower O pH the same O PH higher O PH lower O pH the same H,o add KI add NaCIO C H,0, NaOH pH higher H,O add KOH O pH lower PH the same

Explanation / Answer

A) initially NaoH is present => solution is basic . On addition of acide HClO4 acid base neutralization will take place ( extent will depends on amount of acid added) but since its a weak acid complete neutralization will not take place . But pH will be lower than initial

B) only water is present => solution is neutral, on addition of KI , being a strong electrolyte it will dissociate completely , no change in pH will be observed

C)initially NaoH is present => solution is basic . On addition of NaClO4 , ClO4- with H2O will produce OH- ions , therefore pH will be higher

D) only water is present => solution is neutral, on addition of KOH, hydroxide ion concentration will increase => pH will be higher

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