Trying to take file numbers from a file, pass them to sed to change strings in corresponding lines

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# 1  
Old 04-05-2014
Trying to take file numbers from a file, pass them to sed to change strings in corresponding lines

I have a bunch of file numbers in the file 'test':

I'm trying the above command to change all the instances of "H" to "Na+" in the file testsds.pdb at the line numbers indicated in the file 'test'. I've tried the following and various similar alternatives but nothing is working:

cat test | while read line; do line=$line"s"; sed -i "$line/H  /Na+/" testsds.pdb >> well ; done

Any help would be greatly appreciated.
# 2  
Old 04-05-2014
Give us an example of the current data and expected changes...we shall try
This User Gave Thanks to SriniShoo For This Post:
# 3  
Old 04-05-2014
awk 'NR==FNR{a[$0]=1;next}a[FNR]==1{gsub ("H","Na+")}1' test testsds.pdb

This User Gave Thanks to bartus11 For This Post:
# 4  
Old 04-05-2014
awk 'NR==FNR{a[$0]=1;next}a[FNR]==1{gsub ("H","Na+")}1' test testsds.pdb

^ works flawlessly, thank you.
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