the table below lists some acids and bases.\n| strong acids | weak acids | weak bases | strong bases |\n|…
the table below lists some acids and bases.\n| strong acids | weak acids | weak bases | strong bases |\n| ---- | ---- | ---- | ---- |\n| hbr | ch₃cooh | nh₃ | naoh |\n| hno₃ | hcooh | nh₄oh | koh |\n| h₂so₄ | | | ca(oh)₂ |\nwhich reaction yields a salt that has a ph < 7?\no koh + hbr\no hcooh + koh\no ca(oh)₂ + h₂so₄\no nh₃ + hno₃
Answer
Explanation:
Step1: Recall salt - pH relationship
Salts formed from strong acid - weak base reactions have pH < 7.
Step2: Analyze each option
- For $KOH + HBr$: $KOH$ is a strong base, $HBr$ is a strong acid. The salt $KBr$ has pH = 7.
- For $HCOOH+KOH$: $HCOOH$ is a weak acid, $KOH$ is a strong base. The salt $HCOOK$ has pH > 7.
- For $Ca(OH)_2 + H_2SO_4$: $Ca(OH)_2$ is a strong base, $H_2SO_4$ is a strong acid. The salt $CaSO_4$ has pH = 7.
- For $NH_3 + HNO_3$: $NH_3$ is a weak base, $HNO_3$ is a strong acid. The salt $NH_4NO_3$ has pH < 7.
Answer:
$NH_3 + HNO_3$