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.
Honey<span> is a </span>homogeneous<span> mixture because it has the properties that define</span>homogeneous<span> solutions or mixtures.</span>
Answer:
This structure shows that, "<span>Water is polar, which means it has an uneven distribution of charge making it a good solvent of other polar molecules".
Explanation:
When the Electronegativity difference between two atoms joint through covalent bond is greater than 0.4 and less than 1.7, then the bond is said to be polar bond, and molecule containing polar bonds with asymmetry are said to be polar molecules. In water the Electronegativity difference between Oxygen atom and Hydrogen atom is calculated as,
E.N of Oxygen = 3.44
E.N of Hydrogen = 2.20
-------------
Difference 1.24
Hence, the bond is Polar covalent bond.
Secondly, as we know that Like dissolves Like, so water being polar in nature will interact with polar compounds. And polar compounds will tend to dissolve in water. So, water is a good solvent for polar compounds.</span>
Round off .00042557 to three significant digits is = 0.000426
<h3>What is round of value ?</h3>
- If 5, 6, 7, 8, or 9 come after the number you are rounding, round it up. For instance, 40 is the result of rounding 38 to the nearest ten.
- If the numbers 0, 1, 2, 3, or 4 come after the number, round it down. If 33 is rounded to the nearest ten, it becomes 30.
- To estimate a certain number in a context, rounding is a process. Look at the next digit in the correct position to determine how to round a number; if it is less than 5, round down, and if it is 5 or more, round up.
Given
The digit of 00042557
Three significant digits is 0.000426
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