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77julia77 [94]
3 years ago
14

Can anyone help me for these 2 questions

Chemistry
1 answer:
Fynjy0 [20]3 years ago
3 0
1.D 2.A that is pretty hard
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What is the ph of a buffer prepared by adding 1.00 l of 1.0 m hcℓ to 750 ml of 1.5 m nahcoo? ka = 1.7 x 10-4?
alexandr1967 [171]
Ph = 2.837 ( solution is attached ) 

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Why does H2 is form more quickly than Cl2?
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Borax (na2b4o7·10h2o; fw = 381.372 g/mol; density = 1.73 g/ml), a primary standard, was used to standardize a solution of hno3.
SashulF [63]
<span>0.06355391 mol The balanced equation for the reaction is Na2B4O7*10H2O + 2 HNO3 = 2 NaNO3 + 4 H3BO3 + 5 H2O So for each mole of Borax to neutralize, it takes 2 moles of HNO3. Calculate number of moles of Borax 0.2619 g / 381.372 g/mol = 0.0006867 mol Moles of HNO3 used = 0.0006867 mol * 2 = 0.0013734 mol Molarity is defined as moles per liter so divide the number of moles used by the volume in liters. So 0.0013734 / 0.02161 = 0.06355391 mol</span>
3 0
4 years ago
Convection currents in Earth's core transfer heat and material to the surface.
sweet-ann [11.9K]

Answer: False

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8 0
3 years ago
How many meters did the bus travel in 4.5 minutes
sertanlavr [38]

Answer:

Using the graph, we can see that after 4.5 minutes, the bus traveled 4500 meters. Find 4.5 on the x axis, and then see what y value it corresponds to.

Let me know if this helps!

3 0
3 years ago
Read 2 more answers
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