Which molecule will form a solution with a very low pH? H3PO4 H2O NaOH KOH
2 answers:
Answer: Option (a) is the correct answer.
Explanation:
A solution which has more number of hydrogen ions will be acidic in nature and its pH will be less than 7. Whereas a solution which has more number of hydroxide ions will be basic in nature and thus, its pH will be greater than 7.
Also, pH =
Therefore, a low pH means pH will be very less than 7.
The given molecules will dissociate as follows.
being a neutral molecule will not dissociate and pH of water is 7. Hence, it is a neutral molecule.
So, we can see that gives maximum number of hydrogen ions. Therefore, we can conclude that molecule of
will form a solution with a very low pH.
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Answer:
The correct answer is B.
Explanation:
The molecule of water has 2 atoms of hydrogen and 1 atom of oxygen.
The ratio of masses are given as:
This illustrates the law of definite proportions which is also known as law of constant compositions .
The law states that 'the elements combining to form compound always combine in a fixed ratio by their mass.'
Whereas :
Law of multiple proportion states that when two elements combine with each other to form more than one compounds , the mass of one element with respect to the fixed mass of another element are in ratio of small whole numbers.
Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.
In a balanced chemical reaction ,total mass on the reactant side must be equal to the total mass on the product side.
Law of conservation of energy states that energy can neither be created nor be destroyed but it can only be transformed from one form to another form.