Answer:
Chemical W is a pure substance
Explanation:
We can conclude that the substance W is a pure substance. Matter on a broad basis can be classified as either pure or distinct substance and impure substances (mixtures).
- Pure substances are elements and compounds.
- All the parts are homogenous.
- They have a definite composition.
- They cannot be split by physical means.
So, since we can only split the substance into elements X, Y and Z with no simpler units, W is a compound and a pure substance.
Explanation:
The solution of the lactic acd and sodium lactate is referred to as a buffer solution.
A buffer solution is an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa. In this case, the weak acid is the lactic acid and the conjugate base is the sodium lactate.
Buffer solutions are generally known to resist change in pH values.
When a strong base (in this case, NaOH) is added to the buffer, the lactic acid will give up its H+ in order to transform the base (OH-) into water (H2O) and the conjugate base, so we have:
HA + OH- → A- + H2O.
Since the added OH- is consumed by this reaction, the pH will change only slightly.
The NaOH reacts with the weak acid present in the buffer sollution.
Answer:
The law of conservation of mass states that mass cannot be created or destroyed only transfered. So when a size change takes place the mass is being transfered into something else. During a state change the mass is being transfered into another state of matter. When a substance dissolves into another liquid the mass is still their just into another state.
Explanation: