Answer: PH= 1.4
Explanation:
n(mole)= concentration(c)× volume(v)
n(HClO4) = 0.08 ×0.03
n(HClO4)= 0.0024 mole
n(Ba(OH)2) = 0.28 × 0.05
n(Ba(OH)2) = 0.014
2HClO4 + Ba(OH)2.....>Ba(ClO4)2 + 2H2O.
Hence, the limiting reagent is perchloric acid. According to the reaction:
0.0024 HClO4 req 1/2× 0.0024 of Ba(OH)2.
n(Ba(OH) reacted= 0.0012
Excess n(Ba(OH)2) = 0.014-0.0012
Excess n(Ba(OH)2) = 0.0128
Conc(Ba(OH)2) unreacted = 0.0128/.32 (vol. of mix is 32ml)
= 0.04M = [H+]
PH = -log[0.04] = 1.397
PH= 1.4
0.90g /cm^2
Density is a value for mass, such as kg, divided by a value for volume, such as m3. Density is a physical property of a substance that represents the mass of that substance per unit volume. To calculate for the density of the unknown metal, we simply divide the mass of the substance by the volume measured. We do as follows:
Density = mass / volume
Density = 222.50 g / 25 mL
Density = 8.9 g/mL
Answer:
B) 2
Explanation:
There are two significant figures in given measurement,
2, 0
Significant figures:
1= The given measurement have four significant figures 1534.
2= All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.
3= Leading zeros are not consider as a significant figures. e.g. 0.03 in this number only one significant figure present which is 3.
4= Zero between the non zero digits are consider significant like 107 consist of three significant figures.
5= The zeros at the right side e.g 2400 are also significant. There are four significant figures are present.
Answer:
The correct answer is b polar covalent
Explanation:
When two atoms joined by covalent bond has difference in their electronegativities at that time polarity arise.
When the electronegativity difference is low such as 1.3 then the polar bond formed by the two atoms are called polar covalent bond.For example H2O
on the other hand polar bond formed by two atoms having high difference in their electronegativities is called ionic bond.For example NaCl.